Efficient light emitting devices based on phosphorescent partially doped emissive layers
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AbstractWe report efficient organic light emitting devices employing an ultrathin phosphor emissive layer. The electroluminescent spectra of these devices can be tuned by introducing a low-energy emitting phosphor layer into the emission zone. Devices with the emissive layer consisting of multiple platinum-complex/spacer layer cells show a peak external quantum efficiency of 18.1%, which is among the best EQE values for platinum-complex based light emitting devices. Devices with an ultrathin phosphor emissive layer show stronger luminance decay with the operating time compared to the counterpart devices having a host-guest emissive layer.
SponsorsThe authors are indebted to Dr Zixing Wang and Prof. Jian Li in School of Materials, Arizona State University for providing some chemicals. Financial support from the National Natural Science Foundation of China (Grant no. 61177030), the Chinese Ministry of Education under the program for New Century Excellent Talents in Universities (Grant no. NCET-11-0705), the start-up Grant (SWU111057) from Southwest University, KAUST, FiDiPro program, Academy of Finland, is acknowledged.
PublisherRoyal Society of Chemistry (RSC)
JournalJournal of Materials Chemistry C