Novel phosphor systems for a white light emitting diode (led)

Details Novel phosphor systems for a white light emitting diode (led) Novel phosphor systems for a white light emitting diode (led)

H - Electricity

01

L

H01L 33/50 (2010.01) C09K 9/00 (2006.01) C09K 11/77 (2006.01)

Patent

CA 2575615

Novel phosphor systems for a white LED are disclosed. The phosphor systems are excited by a non-visible to near-UV radiation source having an excitation wavelength ranging from about 250 to 420 nm. The phosphor system may comprise one phosphor, two phosphors, and may include optionally a third and even a fourth phosphor. In one embodiment of the present invention, the phosphor is a two phosphor system having a blue phosphor and a yellow phosphor, wherein the long wavelength end of the blue phosphor is substantially the same wavelength as the short wavelength end of the yellow phosphor. Alternatively, there may be a wavelength gap between the yellow and blue phosphors. The yellow phosphor may be phosphate or silicate-based, and the blue phosphor may be silicate or aluminate-based. Single phosphor systems excited by non-visible radiation are also disclosed. In other embodiments of present invention, a single phosphor is used to produce white light illumination, the single phosphor having a broad emission spectrum with a peak intensity ranging from about 520 to 560 nm.

L'invention porte sur de nouveaux systèmes de luminophores pour diodes émettrices de lumière blanche. Les luminophores sont excités par des sources de rayonnement allant de la lumière non visible à l'UV proche pour des longueurs d'onde allant d'environ 250 à 420 nm. Un tel système peut comporter un ou deux luminophores, ou même facultativement un troisième et un quatrième. Dans une exécution, le système en comporte deux, l'un bleu et l'autre jaune, la longueur d'onde longue du luminophore bleu étant sensiblement la même que la longueur d'onde courte du luminophore jaune. En variante, il peut y avoir un trou de longueur d'onde entre les luminophores jaune et bleu. Le luminophore jaune peut être à base de phosphate ou de silicate, et le luminophore bleu, à base de silicate ou d'aluminate. L'invention porte également sur des systèmes à un seul luminophore excités par le rayonnement non visible. Dans d'autres exécutions, on utilise pour produire de la lumière blanche un seul luminophore à large spectre d'émission et à pic d'intensité compris entre environ 520 et 560 nm.

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