UV/blue LED-phosphor device with short wave pass, long wave pass

Details UV/blue LED-phosphor device with short wave pass, long wave pass UV/blue LED-phosphor device with short wave pass, long wave pass

1997-05-27

1998-09-29

O'Shea, Sandra L.

Illumination

Light source and modifier

Including selected wavelength modifier

313112, 313113, 313114, 313502, 313506, 313512, 362800, 362293, 362260, 257 98, 257 97, 257 13, H04N 931

Patent

active

058137521

ABSTRACT:
A visible light emitting device for use in lighting and/or display applications includes a UV LED, a phosphor layer on the upper, main light emitting surface of the LED, and a short wave pass (SWP) filter between the LED and the phosphor layer to transmit UV light from the LED to the phosphor layer, as well as to reflect visible light from the phosphor layer in a forward direction, thus enhancing the efficiency of the device. Additional optical filters located on the top of the phosphor layer further enhance efficiency and/or spectral characteristics of the emitted light.

REFERENCES:
patent: 4822144 (1989-04-01), Vriens
patent: 4882617 (1989-11-01), Vriens
patent: 5557115 (1996-09-01), Shakuda
"Interference filters in projection television tubes", L. Vriens, J.A. Clarke et al, Philips Technical Review, vol. 44, No. 7, Mar. 1989, pp. 201-210.

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