Journal
ORGANIC ELECTRONICS
Volume 12, Issue 10, Pages 1663-1668Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2011.06.011
Keywords
Organic light-emitting diode; In situ characterization; Emitter orientation; Phosphorescent emitter; Photoluminescence
Funding
- German Federal Ministry of Education and Research (BMBF) [FKZ 13N10474]
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The orientation distribution of the emissive sites in a phosphorescent Organic LED has been measured utilizing two independent optical methods. In contradiction to common expectations we find a clearly non-isotropic, predominantly parallel emitter orientation in the well-known triplet emitting guest-host system of Ir(MDQ)(2)(acac) blended in an alpha-NPD matrix. This result emphasizes the necessity of more sophisticated assumptions on active emitter properties in quantitative optical OLED analysis, and demonstrates a highly promising approach for OLED efficiency optimization. (C) 2011 Elsevier B.V. All rights reserved.
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