The Journal of Gemmology
Vols. for July 1964 include Proceedings of the Gemmological Association of Great Britain.Over the years the brightness of these devices has improved to a level that allows their use as traffic lights and other full colour displays that can be seen in broad daylight. LEDs emit light by luminescence and a schematic diagram of an LED is shown in Figure 2. When the ... A basic (a) Light emission (b) Sl02 ?a#39;3N4 f a#39;!
| Title | : | The Journal of Gemmology |
| Author | : | |
| Publisher | : | - 2002 |
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