| Artificial light (6) |  |
| Backlight (1) | |
| Beam of light (9) | |
| Blue light (3) | |
| Efficient light (1) | |
| Green light (2) | |
| Infrared light (7) | |
| Light (139) | |
| Light detector (1) | |
| Light pulse (3) | |
| Light source (11) | |
| Monochromatic light (1) | |
| Natural light (2) | |
| Red light (2) | |
| Shining light (1) | |
| Ultraviolet light (53) | |
| Visible light (9) | |
| White light (2) | |
the missing color for producing white light was blue. Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura cracked the blue conundrum in the early 1990s.
Now, thanks to their work, white light LEDS are ubiquitous. In recognition of this energy saving invention, they received the Nobel prize in Physics last year.
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