| Hiroshi Amano |
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[Slide 1]
[Slide 2]
[Slide 3]
[Slide 4]
[Slide 5]
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[Slide 1]
Thank you for the introduction. I am Amano, Meijo University.
Today, I will talk under the title of "Passion and struggle in the development of GaN blue light emitting devices".
About the contents of my talkc at first, I'll talk about why I selected the blue light emitting diode as my research theme, and why it was difficult to realize, which was somewhat already talked about by Professor Akasaki.
Next, following the talk given by Professor Akasaki, I will talk about the work at the development front, in the experimental room and in the clean room, namely about the growth apparatus, the growth methods and the control of conductivity, and the control of emission wavelength which is an example of one of the failures.
And, if I have sufficient time, I will talk about the present and future struggle.
[Slide 2]
When I was a third grade at Nagoya University, we had to select the research theme for our assignment to the research laboratories for the graduation thesis in the fourth grade. At that time, I was very interested in computers, so, if possible, I wanted to work on CPU design. However, there was no laboratory working on the design or research of CPUs in Nagoya University at the time. So, deciding to study the semiconductor that is the base of CPU, I was exploring my research theme.
[Slide 3]
At that time - it was, maybe, my misunderstanding - I felt, from a young person's viewpoint, that the research in the university at the time was research for the sake of research or research for research funds rather than true research. Or, I thought from a cynical viewpoint that they were just researching for the doctorate.
I thought to challenge myself with something more genuine and so it clicked when I found the research theme of the blue light emitting diode in the Akasaki laboratory.
Intuition whispered to me that this was actually research for the future - primary and original research. I decided at once to enter his laboratory.
[Slide 4]
Summarizing why I had selected the theme of the blue light emitting diode, the most important was that nobody could succeed at the time. It was a very challenging theme. Namely, there was the possibility to become the top runner. And the theme stood out because of its closeness to the creation of a final product for people. I had a feeling that I would be able to do a service for people by the accomplishment of this theme. There was no special reason but I wanted to do something for people. From that viewpoint, I sensed the blue light emitting diode was the most attractive theme.
[Slide 5]
I would like to show why blue light emission is difficult, from the viewpoint of the human senses. This chart shows the human eye sensitivity dependence on the light wavelength. This point stands for green light. The human eye is very sensitive to green light. That is, even weak green light can be well detected. On the other hand, the sensitivity to blue light is three hundredths that of green light. That is, in the case of blue light, an intensity of 30 times that of green light is needed to get the same sensitivity for the human eye. So, the blue light was, by nature, difficult to realize.
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