Developments in LEDs for Lighting by Pira International Ltd

By Pira International Ltd

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As discussed earlier, there is one white LED market not obvious to the consumer, that was made possible by the addition of a yellow phosphor to the higher power blue LEDs, namely back lighting for the very large hand-held device market. It has become the largest LED market segment (greater than 60% of high brightness LEDs and a $3 billion market). Perhaps more important however, it has supported the development of ever more powerful, ever less expensive white LEDs that will soon open the door to the general lighting market.

Use of phosphors Because of the LED backlighting market domination, its LEDs are a very important product of commerce, and phosphors are a key factor in their applicability. 3. If enough cost performance benefits can be demonstrated, they may also be used to make green and red LEDs, from blue LED phosphor excitation. However, more than 90% of today’s $3 billion white LED market uses a blue LED with one or more phosphors, depending on the colour rendition and colour temperatures required. The first company to make commercial blue LEDs was Nichia Chemical from Japan (also a phosphor company) and in 1996 it combined one of its standard yellow phosphors, a cerium doped yttrium aluminium garnet (YAG:Ce) derivative, with the blue LED and offered the first commercial white LED.

4), a family of tunable ZnSSe phosphors from Phosphor Tech, where the colour is controlled by the sulphur to selenium ratio and improved stability is obtained from oxide encapsulation. Evident is using ‘molecular plating’ techniques on QD zinc blend phosphors to attain quantum yields approaching 100%. Interestingly, Evident also makes lead sulphide and selenide phosphors that are active at IR wavelengths and they are used for equipment or personnel tagging for night vision recognition. Polymer-dispersed lead sulphides on an indium tin oxide electrode have been reported to produce electroluminescence with an applied potential.

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