Method and apparatus for evaluating luminous efficiency
US5227638A · kind A · utility
1Cited by
1References
11Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 24, 1991 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Jul 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/6489
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.