Light emitting diode with surface emission

Details Light emitting diode with surface emission Light emitting diode with surface emission

1983-12-19

1986-02-11

Davie, James W.

Coherent light generators

Particular component circuitry

Optical pumping

357 16, 357 61, 372 45, H01S 318, H01S 319, H01L 3300

Patent

active

045701725

ABSTRACT:
A light emitting diode (LED) is provided which has light emission taking place through the surface of a window layer and which consist of at least one active layer between a substrate and a window layer. Under biassing, the active layer emits isotropic radiation of wave length .lambda.. The LED of the invention comprises a re-emitting layer which absorbs the part of the radiation which is emitted in the direction of the substrate and re-emits it isotropically with a wave length very close to that of the active layer. For that, the re-emitting layer is made from a material whose prohibited band height is very close to but less than that of the active layer. If the substrate is transparent, it may be situated between the emitting layer and the re-emitting layer.

REFERENCES:
patent: 3946417 (1976-03-01), Jacobus, Jr. et al.
patent: 4280107 (1981-07-01), Scifres et al.
patent: 4319259 (1982-03-01), Oshima et al.
patent: 4338577 (1982-07-01), Sato et al.

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