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Shuji Nakamura – the ‘Edison’ of the blue LED revolution

Shuji Nakamura’s journey inventing blue LED is an example of a ‘high risk, but high reward’ strategy for scientific innovation. Moreover, it lends a sneak-peek at how scientific research unfolds in a corporate environment.

Karthik Vinod

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Credit: Jijin M.K. / EdPublica

If there is ever an inspiring story about perseverance it would be Thomas Edison’s much retold story of the commercially viable incandescent light bulb in 1879.

In response to questions regarding ‘missteps’ with developing the bulb, Edison famously said, “I have not failed 10,000 times—I’ve successfully found 10,000 ways that will not work.”

But scientific research comes with its own complexity and challenges. Edison, arguably, had resources at his disposal. What is it to charter a breakthrough being a scientist in a corporate environment, when all odds are stacked against you? 

Today’s EP Know the Scientist explores a scientist, who strived in an environment of desperation, and prevailed despite all odds. Rivaling Edison’s stature a century later, came the Japanese engineer and physicist, Shuji Nakamura.

Nakamura invented the blue-light emitting diode (LED) bulb in 1993, while he was the chief engineer for Nichia Corporation in Japan. The invention of the blue LED set up the second light revolution in the mid-1990s. 

Shuji Nakamura holding a blue-LED. Credit: Ladislav Markus / Wikimedia

Blue-LED eluded the electrical industry which needed it to complete the coveted trio of red, green and blue LEDs. Superimposing and tuning the three different colors, it was easy to cover for the entire visible light spectrum.

Smartphone screens, digital signages, traffic lights or spot lights all depended exclusively on LED when they were rolled out. 

LED bulbs paved the world for cheaper lighting that was simultaneously energy efficient. They can emit visible light of distinct colors, while consuming at least 75% less electricity  on average than incandescent light bulbs. In incandescent bulbs, their bulk energy output is wasted in heat, with only 2% emitted as polychromatic light. 

As the world battles for cleaner energy resources, LEDs set off the revolution around the same time when there was consensus already that we need to be more energy efficient. 

The ‘high risk, but high reward’ strategy

Nichia Corporation was seeing losses for years in the LED market, despite selling red and infrared LEDs. That’s when Shuji Nakamura, the chief designer developing these LEDs, entered the scene as he came under pressure to come up with a new product of their own. Nakamura pitched an idea to actually researching and inventing a blue-LED – a last minute gamble to save Nichia’s future. It sounds ludicrous that Nakamura aimed to research blue LEDs, when semiconductor physicists of even higher repute worked in well equipped laboratories. 

There were two materials that physicists had narrowed down to which had the band gap energy in semiconductors to emit blue light upon stimulation. One was zinc selenide, and the other was gallium nitride. Gallium nitride was deemed difficult to grow a perfect lattice, which meant physicists pushed resources towards unlocking the band gap energy in zinc selenide. In a game of high risk, but high reward strategy, Nakamura decided to dedicate time to research gallium nitride instead!

Gallium nitride crystal. Credit: Opto-p / Wikimedia

The reason was partly because he had a contingency plan in place. In Japan, one can get five papers published to be awarded one. Nakamura was banking on continuing his research until he can get those five papers published, to be assured as PhD. That doesn’t mean he was desperate enough to lose sight of his original goal to research with gallium nitride. By pursuing this semiconductor, he could avoid competition from physicists everywhere else! He had a higher chance of reporting something novel that merits a paper. 

Building academic networks

There were other challenges – some important to maintain. A healthy research environment wasn’t assured, despite backing from Nobuo Ogawa, then boss at Nichia. His son, Eiji Ogawa, who succeeded him, had friction with Nakamura. Despite Eiji’s repeated attempts to get Nakamura to pursue research with zinc selenide, Nakamura was stubborn as ever.

As much as Nakamura’s story does sound like a prodigious, lone engineer who made a discovery that escaped many, it isn’t actually true. Nakamura did collaborate occasionally for leads with other scientific researchers while working on gallium nitride. 

Japan, for one, has some of the brightest minds in the world at the forefront of scientific research. So did the US. 

Representative image of a chemical vapor deposition (CVD) reaction chamber. Credit: NASA / Wikimedia

Nakamura kept abreast of moves on gallium nitride, traveling to Nagoya University within Japan, where Hiroshi Amano and Isamu Akasaki found a way to create the perfect lattice.

 In the US, Nakamura learnt the art of designing a ‘metal oxide chemical vapor deposition (MOCVD) reactor’. This is a technique used across material physics to grow a 2D layer of a material over a substrate. 

Nakamura built extra modifications to the MOCVD when he was back in Japan. Adding an extra nozzle, Nakamura created the ‘two-flow MOCVD’ technique that at last solved the blue-LED conundrum. And the rest is history. 

Nobel Prize and his 70th birthday

Nakamura, along with Amano and Akasaki – his Nagoya University collaborators, shared the 2014 Nobel Prize in Physics, “for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources.”

Nichia’s fortunes grew like none before. From a gross receipt of $200 million in 1993, they had $800 million by 2001 – with 60% contribution by sale of Nakamura’s blue-LED technology. Nichia has supplied LEDs for bigger clients including Apple and other electronic companies since then, and remains a market leader in Japan. 

However, he received no favors from Nichia. Nichia barely increased his paycheck after his invention that set the precedent for lighting across the world. Nakamura made the decision to leave for the US where he got much better opportunities and a salary. But he left only after fulfilling his backup plan, publishing five papers, to get an engineering PhD from the University of Tokushima in 1995.

Nichia followed him even to the US.

A decade ago, Nichia filed a lawsuit against him claiming intellectual blue LED technology with a company Nakamura worked with. However, Nakamura prevailed and received $8 million in a settlement.

Nakamura, who’ll be a septuagenarian later this March, now holds a position as an engineering professor at the University of California, Santa Barbara, US. Even at 70, he never retired.

An engineer in training, who won a physics prize, his tale brings one that’s never repeated often. A story of undomitable resilience, unwavering in every challenge they face.

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Mysterious, resilient, and radiant: The timeless legacy of Marie Curie

A scientist in her own right, a symbol of resilience, and a martyr to science—Marie Curie’s life was as radioactive as her path-breaking discoveries

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Science is not only a pursuit of knowledge, but a passion that can consume a life—sometimes even the very body of its creator. This is the dramatic tale of one such life, the life of Marie Curie, whose pioneering contributions to science forever altered the course of history.

Marie Curie, a name synonymous with perseverance and scientific brilliance, lived and died for science, transforming the world with her discoveries. Her life was one of constant struggle against societal norms, poverty, and personal loss, yet she rose to become one of the most celebrated scientists in history—earning two Nobel Prizes, in two different fields, in a time when women were largely excluded from the scientific community. Her relentless pursuit of knowledge, and the cost at which she achieved it, continues to inspire generations of scientists.

Born Maria Salomea Skłodowska on November 7, 1867, in Warsaw, Poland—then under Russian rule—Marie came from a family of educators who instilled in her a love for learning. However, her early life was filled with hardship. At just nine years old, she lost her sister, and at eleven, her mother passed away from tuberculosis. These tragic losses shaped her character, leading her to abandon her Christian faith and fueling her desire to escape the constraints of her environment through education.

In a country where higher education was largely inaccessible to women, Marie defied all odds. She secretly studied at the “Flying University,” a clandestine institution offering advanced learning despite the Russian occupation. After years of financial hardship and personal sacrifice, she moved to Paris in 1891 to attend the Sorbonne (University of Paris), where she earned degrees in physics, chemistry, and mathematics.

It was in Paris that Marie met Pierre Curie, a brilliant physicist whose work on magnetism and crystallography was already well known. Their intellectual partnership quickly blossomed into a romantic one. In 1895, they married, and together they embarked on cutting-edge research in radioactivity, a term that Marie herself coined.

Pierre and Marie Curie in the laboratory

Though their early years were marked by financial difficulties—Marie sometimes had to work as a governess to support her research—the couple’s scientific collaborations were prodigious. In 1898, they discovered the elements Polonium (named after Marie’s homeland, Poland) and Radium, forever altering the landscape of chemistry and physics.

Their work was transformative. While investigating the properties of uranium, the Curies discovered that certain materials emitted a form of energy that could penetrate matter. This discovery laid the foundation for the study of radioactivity. Marie Curie’s research, however, was far from simple theory. She showed that uranium’s radioactivity was intrinsic to the atom, a revolutionary insight that led to the birth of atomic physics.

In 1903, Marie and Pierre Curie, along with Henri Becquerel, were awarded the Nobel Prize in Physics for their pioneering work in radioactivity. It was an extraordinary achievement, and Marie became the first woman ever to receive a Nobel Prize. This historic honour, however, was only the beginning.

Marie’s life, though marked by scientific triumph, was also filled with personal tragedy. In 1906, just three years after receiving the Nobel Prize, Pierre Curie was tragically killed in a street accident. His death left Marie devastated, but her resilience was remarkable. She took over his position as a professor at the Sorbonne, becoming the first woman to hold such a post at the prestigious university.

Wedding Photo of Pierre and Marie Curie

Marie’s drive and determination did not wane in the face of personal loss. In 1911, she was awarded the Nobel Prize in Chemistry for her work in isolating pure radium and polonium, making her the first person—and remains the only woman—to win Nobel Prizes in two different scientific fields. Her acceptance speech, in which she credited her late husband Pierre, moved many to tears.

As the First World War broke out in 1914, Marie’s scientific genius took on a new form. Understanding the importance of radiology in medicine, she took her research to the battlefield. With the help of her colleagues, Marie developed mobile X-ray units—called “Little Curies”—which she personally drove to the front lines to assist in diagnosing injuries. Her efforts saved countless lives, and during the war, more than a million soldiers received X-ray examinations due to her work.

Despite her scientific fame, Marie’s health began to deteriorate due to her constant exposure to radioactive materials. The very substances she had spent her life researching were slowly poisoning her. In 1934, Marie Curie passed away from aplastic anemia, a disease caused by the prolonged exposure to radiation.

In an odd twist, the very radioactive materials that made Marie Curie famous also played a role in her untimely death. Her personal belongings, including books, notes, and even her clothing, remained highly radioactive long after her death. In fact, her laboratory notebooks, now preserved in Paris, are still radioactive today—scientists must wear protective gear to handle them.

At the first Solvay Conference (1911), Curie (seated, second from right) confers with Henri Poincaré; standing nearby are Rutherford (fourth from right), Einstein (second from right), and Paul Langevin (far right).

The legacy of Marie Curie, however, is far more than the danger of radiation. Her work laid the groundwork for cancer treatments, nuclear energy, and the development of atomic weapons. Yet, Curie herself was deeply committed to the idea that scientific discoveries should be used for the benefit of humanity, not destruction. During her life, she was adamant that the energy she discovered could and should be used to improve health and welfare, not war.

Marie’s daughters, Irène and Ève, carried on the family legacy of scientific achievement. Irène, like her mother and father, went on to win the Nobel Prize in Chemistry in 1935 for her work on radioactivity, making the Curies one of the few families to have produced multiple Nobel laureates. Irène’s own life, unfortunately, was similarly marked by tragedy, as she, too, suffered from leukemia—a consequence of the radiation exposure passed down through the family.

While Ève, the younger daughter, pursued a career in writing and journalism, it was the scientific legacy of her parents that endured. Today, the Curie family’s contributions to science continue to be honored worldwide.

In today’s world, the impact of Marie Curie’s work is felt across many disciplines. The very essence of nuclear science, from energy generation to medical diagnostics, is built on the foundation that she and her husband established. The applications of her discoveries are so widespread that it’s impossible to escape their relevance. From life-saving cancer treatments using radium and radiation therapy to modern-day technologies such as X-rays and PET scans, Curie’s discoveries have directly influenced these advancements.

In an age where scientific innovation continues to transform society, Marie Curie’s life serves as a reminder of the sacrifices scientists make in pursuit of knowledge. Her resilience, determination, and focus on contributing to the greater good are attributes that resonate deeply in today’s world of rapid technological change and the constant battle against existential global challenges like climate change, energy crises, and health pandemics. The courage to ask difficult questions, confront the unknown, and risk everything for the betterment of humanity is something that continues to inspire not just scientists but anyone who seeks to push the boundaries of what is possible.

Her story also speaks to the ongoing fight for gender equality in science. Despite the significant strides made toward inclusivity, women remain underrepresented in scientific fields, particularly in leadership roles. Marie Curie’s legacy reminds us of the importance of diversity in innovation and the need to break down barriers to ensure that talent, regardless of gender, is nurtured and celebrated.

Curie’s life has transcended time and continues to inspire, even in the 21st century. The 2019 biographical film Radioactive, based on her life, brought her story to a new generation, exploring not just her scientific achievements but also the personal struggles and sacrifices she made. The film serves as a testament to the complexities of her legacy—both as a scientist who reshaped the future and as a woman who defied societal norms to do so.

Marie Curie’s contributions to science were not just about discovering new elements or phenomena; they were about changing the way humanity understood the world. She unlocked the mysteries of the atom and laid the groundwork for technologies that are still saving lives today. She did so at great personal cost, but her story is not just one of sacrifice—it’s one of triumph, resilience, and an unwavering dedication to science.

Even now, decades after her death, Marie Curie’s discoveries continue to illuminate the way forward in fields like medicine, energy, and environmental science. Her life reminds us that science is not just about the lab or the classroom; it is about the real-world impact that research can have on improving human lives and addressing global challenges.

References:

1. Curie, M. (1923). Pierre Curie (Autobiography).

2. “Marie Curie: A Biography” by Susan Quinn. (1995).

3. Marie Curie (2019) directed by Marjane Satrapi.

4. “Radium and Its Applications in Medicine: The Legacy of Marie Curie” by Francesca Rossi. (Journal of Nuclear Medicine, 2012).

5. The Life and Legacy of Marie Curie by Rosalind P. Williams. (Oxford University Press, 2009).

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Pierre Curie: The precision of a scientific pioneer

Pierre Curie is perhaps best known for his work on magnetism

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Pierre Curie image source: Wikimedia Commons

Pierre Curie (1859–1906) was a man whose legacy has shaped the course of modern science, yet his name is often overshadowed by that of his famous wife, Marie Curie. Despite this, Pierre’s contributions to physics, particularly in the field of magnetism and the discovery of radioactivity, were revolutionary and continue to influence scientific research today.

Early Life and Education

Born in Paris on May 15, 1859, Pierre Curie grew up in an intellectually stimulating environment. His father, Eugene, was a physician, and his mother, Sophie, was a teacher, which cultivated in Pierre a deep passion for learning. From an early age, Pierre showed an exceptional aptitude for mathematics and physics, subjects that would later define his career.

By the time Pierre was 16, he had already completed his studies in mathematics and physics, earning a degree from the prestigious Sorbonne University in Paris. This early foundation in scientific inquiry laid the groundwork for his future innovations.

In 1895 together with his brother Jacques Curie, Pierre Curie developed the Curie point—the temperature at which certain magnetic materials lose their magnetism

Innovative Work in Magnetism and Crystallography

Pierre Curie is perhaps best known for his work on magnetism. In 1895, together with his brother Jacques Curie, he developed the Curie point—the temperature at which certain magnetic materials lose their magnetism. This work, foundational in the study of thermodynamics and magnetism, continues to be a key concept in modern physics.

Additionally, Pierre Curie’s research in crystallography and his study of the magnetic properties of materials played a pivotal role in the development of solid-state physics. His work laid the foundation for understanding the relationship between a material’s structure and its magnetic properties, which remains essential in materials science today.

The Discovery of Radioactivity

However, Pierre Curie’s most significant contribution came from his work on radioactivity, which would forever alter the understanding of matter itself. In the late 19th century, the mysterious rays emitted by certain substances, like uranium, intrigued scientists. Working alongside his wife, Marie Curie, Pierre embarked on a series of experiments to better understand this phenomenon.

Their work, starting in 1898, led to the discovery of two new elements: polonium and radium. Marie Curie coined the term “radioactivity” to describe the spontaneous emission of radiation from these elements, but it was Pierre’s precise experimental methods and scientific rigor that helped bring clarity to the phenomenon. Their discovery of radium, in particular, was a breakthrough that would lead to numerous advancements in medical treatments, including cancer therapy.

Nobel Recognition and Collaboration with Marie Curie

In 1903, Pierre Curie, together with Marie Curie and Henri Becquerel, was awarded the Nobel Prize in Physics for their joint work on radioactivity. The recognition marked the first time a Nobel Prize had been awarded to a couple. However, what makes this achievement particularly notable is that Pierre Curie insisted that Marie be included in the award, a gesture that demonstrated not only his scientific partnership with his wife but also his support for women in science, a rare stance in the male-dominated field of the time.

Tragically, Pierre Curie’s life was cut short in 1906 when he was killed in a street accident at the age of 46

Pierre Curie’s dedication to scientific rigor and his ability to work collaboratively with Marie, his wife and fellow scientist, was vital to their success. Their work would not only earn them the Nobel Prize but also set the stage for later advancements in nuclear physics and medicine.

Tragic Loss and Enduring Legacy

Tragically, Pierre Curie’s life was cut short in 1906 when he was killed in a street accident at the age of 46. His death was a blow to both the scientific community and his family. However, his legacy continued through his wife, Marie, who carried on their groundbreaking work and became the first woman to win a second Nobel Prize.

Today, Pierre Curie is remembered as a visionary physicist whose discoveries were instrumental in shaping the fields of physics, chemistry, and medicine. His contributions to magnetism, crystallography, and radioactivity remain foundational to scientific inquiry. His work continues to inspire scientists across disciplines and serves as a reminder of the power of precision, collaboration, and dedication in the pursuit of knowledge.

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The ‘Godfather of AI’ has a warning for us

The speed with which large language models such as ChatGPT has come to the fore has re-invigorated serious discussion about AI ethics and safety among scientists and humanities scholars alike.

Karthik Vinod

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Credit: Jijin M.K. / Ed Publica

The quest to develop artificial intelligence (AI) in the 20th century had entrants coming in from various fields, mostly mathematicians and physicists.

Geoff Hinton, famously known as the ‘godfather of AI’ today, at one point dabbled in cognitive psychology as a young undergraduate student at Cambridge. Allured by the nascent field of AI in the 1970s, Hinton did a PhD from Edinburgh where he helped revive the idea of artificial neural networks (ANNs). These ANNs mimic neuronal connections in animal brains, and has been the staple of mainstream research into AI. Hinton, a British-born Canadian, since then moved to the University of Toronto, where he’s currently a professor in computer science.

In 2018, Hinton’s contributions to computer science and AI caught up to him. He was awarded a share of the coveted Turing Award, which is popularly known as the ‘Nobel Prize in Computing’. His 1986 work on ‘back propagation’ helped provide the blueprint to how machines learn, earning him the popular recognition of being one of the ‘fathers of deep learning’ as well.

The last two years saw artificial intelligence become commonplace in public discourse on technology. Leading the charge was OpenAI’s ChatGPT, as large language models (LLMs) found use in a whole host of settings across the globe.  OpenAI, Google, Microsoft and their likes are engaged in upping the ante.

But this sudden spurt has alarmed many and is re-invigorating a serious discussion about AI ethics and safety. Last year, Elon Musk was amongst signatories of a letter requesting to halt AI research for a while, fearing the ever-increasing odds that sentient AI may be in the horizon. But sociologists believe this risk is simply overplayed by billionaires to avoid the real-world problems posed by AI gets swept under the carpet. For example, job losses will occur for which there is no solution in sight about what should be done to compensate those who may lose their work.

However, in a very technical sense, computer scientists like Hinton have taken to the fore to make their views explicitly clear. In fact, Hinton ended his decade long association with Google last year to speak freely about what he thought was a competition between technology companies to climb upon each other’s advances. He, like many computer scientists, believe humanity is at a ‘turning point’ with AI, especially with large language models (LLMs) like ChatGPT at the fore.

“It’s [LLMs] very exciting,” said Hinton in a Science article. “It’s very nice to see all this work coming to fruition. But it’s also scary.” 

One research study suggests these LLMs are anything but ‘stochastic parrots’ that outputs what it’s been instructed to do. This doesn’t mean AI is anywhere close to being sentient today. However, Hinton and other computer scientists fear humanity may unwittingly run into the real risk of creating one. In fact, Hinton was one of several signatories of an open letter requesting policy makers to consider the existential risk of AI.

Creating a sentient AI, or artificial general intelligence (AGI, as it’s technically called) would vary in definition based on scientists researching them. They don’t exist for one today, and nobody safe to say knows what it would look like. But in popular lore, these can simply mean Skynet from the Terminator movies, becoming ‘self-aware’. Hinton was of the opinion that AI already surpassed biological intelligence in some ways. However, it must be bore in mind that AI isn’t anymore a stochastic parrot than it is sentient. Hinton doesn’t say more powerful AI would make humans all redundant. But AI could do many routine tasks humans already do, and thus replace them in those in time. Navigating them is a task that requires views that are transdisciplinary.

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