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Determining the Radiation Efficiency for Recombination Radiation in Gallium Arsenide Diodes

IP.com Disclosure Number: IPCOM000096781D
Original Publication Date: 1963-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Cheroff, G: AUTHOR [+3]

Abstract

The determination of the absolute value of the radiation efficiency for the recombination radiation of gallium arsenide diodes is tedious and time consuming when using the standard photometric methods. This is due to the special inhomogeneity of the light output from the diodes. This apparatus for determining this radiation efficiency is simple and fast.

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Determining the Radiation Efficiency for Recombination Radiation in Gallium Arsenide Diodes

The determination of the absolute value of the radiation efficiency for the recombination radiation of gallium arsenide diodes is tedious and time consuming when using the standard photometric methods. This is due to the special inhomogeneity of the light output from the diodes. This apparatus for determining this radiation efficiency is simple and fast.

Gallium arsenide diode 10 connected to current source 12 is immersed in liquid nitrogen bath 13 contained in dewar flask 14. Its inside surface is coated with a low loss, highly dispersive material. The top of flask 16 has its inner surface substantially covered by silicon solar cells 18 having a known surface area. Light emitted by diode 10 is reflected many times before being absorbed. At equilibrium, the total radiated power is partly absorbed by cells 18 and the remainder is lost in the system. The unknown losses in the system can be determined by introducing additional losses in the form of an absorbing material of known surface area and observing the new short circuit current reading for the silicon detectors.

To eliminate errors due to differences of emissivity, silicon cells are introduced into the container to act as the absorbing medium. In performing the above measurements, it is assumed that the reflections and the dispersion due to the coating on the interior surface of dewar flask 14 cause light source 10 to...