Light-emitting diode array with reflective layer

Details Light-emitting diode array with reflective layer Light-emitting diode array with reflective layer

Filed on

1991-01-30

Date issued

1991-10-08

Examiner

Mintel, William

Patent Class

Coherent light generators

SubClass

Particular component circuitry

SubSubClass

Optical pumping

Other Related Categories

357 45, 357 4, 357 16, 372 45, 372 46, 372 50, G01L 3300

Type

Patent

Status

active

Patent number

050558935

Description

ABSTRACT:
A light-emitting diode array has an active layer on a surface of a substrate and a multiple reflective layer between the substrate and the active layer. The active layer is of a semiconductor material which emits light when subjected to carrier injection. The multiple reflective layer is formed of a plurality of pairs of layers of semiconductor materials having different refractive indexes. The layer of the multiple reflective layer which is adjacent the active layer has a higher energy gap than that of the active layer. The layers of the multiple reflective layer which have the higher refractive index have a smaller energy gap than the wavelength of the light emitted by the active layer.

REFERENCES:
patent: 4616241 (1986-10-01), Biefeld et al.
patent: 4730207 (1988-03-01), Yamazaki
patent: 4868614 (1989-09-01), Yamazaki
patent: 4943970 (1990-07-01), Bradley
patent: 4949351 (1990-08-01), Imanaka
patent: 5020066 (1991-05-01), Iga et al.
Dumke, "Simple Planar Double-Heterojunction Laser Structure", IBM Technical Disclosure Bulletin, vol. 16, No. 4, Sep. '73, p. 1186.
Blum et al., "Solid State Light-Emitting Diodes", IBM Technical Disclosure Bulletin, vol. 13, No. 9, Feb. 1971, p. 2494.
Blum et al., "Double Heterojunction Laser Arrays", IBM Technical Disclosure Bulletin, vol. 15, No. 7, Dec. 1972, p. 2345.
Blum et al., "Integrated Multicolor Light-Emitting Diode Array", IBM Technical Disclosure Bulletin, vol. 15, No. 2, Jul. 1972, pp. 445-446.

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