Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume 43, Issue 11A, Pages 7733-7736Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.43.7733
Keywords
organic light-emitting device; external quantum efficiency; direct-measurement method; luminance-conversion method; phosphorescence; iridium complex
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We report on the direct measurement of the external quantum efficiency of electroluminescence of organic light-emitting devices with different emission colors and patterns using an integrating sphere and a highly sensitive charge-coupled device spectral analyzer. Using this direct-measurement method, precise external quantum efficiency can be obtained more easily and more quickly than using the conventional luminance-conversion method. This method is shown to be very useful for determining the external quantum efficiency of organic light-emitting devices.
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