Coherent light generators – Particular component circuitry – Optical pumping
Patent
1990-09-28
1991-12-31
Mintel, William
Coherent light generators
Particular component circuitry
Optical pumping
357 16, 357 4, 372 43, H01L 3300
Patent
active
050775880
ABSTRACT:
A multiple wavelength light emitting device having a single p-n junction and at least two light emitting layers within a diffusion region of a minority carrier comprises a p-type Ga.sub.1-x1 Al.sub.x1 As layer, a p-type Ga.sub.1-x2 Al.sub.x2 As layer, a p-type Ga.sub.1-x3 Al.sub.x3 As layer, and an n-type Ga.sub.1-y Al.sub.y As layer, where x.sub.1, x.sub.2, x.sub.3 and Y represent aluminum arsenide mixed crystal ratios of the respective layers. The light emitting alyers, i.e., the p-type Ga.sub.1-x2 Al.sub.x2 As layer and the p-type Ga.sub.1-x3 Al.sub.x3 As layer each have a different band gap to emit an infrared light and a visible light, respectively. Since the infrared and ivsible lights are simultaneously emitted, emission of the infrared light can be confirmed or monitored by the visible light. The light emitting device of the present invention utilizes an energy well for trapping electrons and an energy barrier for preventing electrons from diffusing to improve the whole light emitting efficiency.
REFERENCES:
patent: 4280107 (1981-07-01), Scifres et al.
patent: 4313125 (1982-01-01), Hartman et al.
patent: 4347611 (1982-08-01), Scifres et al.
patent: 4864369 (1989-09-01), Snyder et al.
Takenaka Takuo
Yamada Masato
Yamaguchi Yukihiro
Mintel William
Shin-Etsu Handotai & Co., Ltd.
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