Method and apparatus for evaluating luminous efficiency

Details Method and apparatus for evaluating luminous efficiency Method and apparatus for evaluating luminous efficiency

1991-07-24

1993-07-13

Hannaher, Constantine

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

2504581, 2504591, H01L 3300

Patent

active

052276384

ABSTRACT:
Photoluminescence or electroluminescence from a material substrate is measured in a photon-counting range. Luminous efficiency of the substrate in its normal operation range is evaluated on the basis of the measured data. The luminescence is measured in an excitation range of the material including a transition excitation level corresponding to a transition luminous level from a low luminous range to a regular, intense luminous range. Two-dimensional distribution of the luminous efficiencies can be obtained by measuring the luminescence from small divided areas of the substrate.

REFERENCES:
patent: 4827318 (1989-05-01), Hall et al.
Black et al., "Scanned-Laser Microscope For Photoluminescence Studies", Applied Optics, vol. 11, No. 7, Jul. 1972, pp. 1553-1562.
Stadler et al., "A Technique For Measuring the Saturation of Phosphors at High Current Densities", J. Electrochem. Soc., vol. 120, No. 12, Dec. 1973, pp. 1730-1734.
Love et al., "Fluorescence Quantum Yield Determination By Pulsed Source Single Photon Counting", Analytical Chem, vol. 51, No. 12, Oct. 1979, pp. 1941-1945.

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