Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – Plural light emitting devices
Patent
1998-11-03
2000-07-04
Tran, Minh Loan
Active solid-state devices (e.g., transistors, solid-state diode
Incoherent light emitter structure
Plural light emitting devices
257 98, 257 99, 257100, 257103, 313502, 313503, 313504, 313512, H01L 3300
Patent
active
060842504
ABSTRACT:
A light-emitting device comprising a UV-diode with a primary emission of 300 nm.ltoreq..lambda..ltoreq.370 nm and a phosphor layer including a combination of a blue-emitting phosphor having an emission band, with 430 nm.ltoreq..lambda..ltoreq.490 nm, a green-emitting phosphor having an emission band, with 520 nm.ltoreq..lambda..ltoreq.570 nm and a red-emitting phosphor having an emission band, with 590 nm.ltoreq..lambda..ltoreq.630 nm, emits high-quality white light. The color-rendering index CRI is approximately 90 at a color temperature of 4000 K. The color rendition depends only on the composition of the three phosphors, not on the relation between converted and non-converted light, and hence can be readily controlled and regulated.
REFERENCES:
patent: 5813753 (1998-09-01), Vriens et al.
Justel Thomas
Nikol Hans
Ronda Cees
Fox John C.
Tran Minh Loan
U.S. Philips Corporation
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