Efficiency improvement of flexible phosphorescent organic light emitting diode by inserting a buffer layer

Y. S. Tsai; S. H. Wang; F. S. Juang; S. Y. Su; M. H. Chang; T. E. Hsieh; M. O. Liu

doi:10.1117/12.790932

12 February 2008 Efficiency improvement of flexible phosphorescent organic light emitting diode by inserting a buffer layer

Y. S. Tsai, S. H. Wang, F. S. Juang, S. Y. Su, M. H. Chang, T. E. Hsieh, M. O. Liu

Author Affiliations +

Proceedings Volume 6891, Organic Photonic Materials and Devices X; 68911A (2008) https://doi.org/10.1117/12.790932
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

In this study, we dissolved hole transport layer (HTL) material NPB in THF (tetrahydrofuran) solvant, and spin-coated the N,N'-Bis(naphthalene-l-yl)-N,N'-bis(phenyl)-benzidine (NPB) solution on the surface of Indium Tin Oxide (ITO) anode to enhance the luminance efficiency and lifetime of flexible phosphorescent organic light emitting diodes (POLEDs), where the 2,2',2''-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) was employed as hole blocking layer (HBL) and its thickness was optimized. Such an improvement in the device performance was attributed to the improved hole-electron balance. Finally, we employed 2,9-Dime-thyl-4,7-dphenyl-1,10-phenanhroline (BCP) or TPBi as hole blocking layer. The maximum luminance efficiency reaching 24.4 cd/A can be obtained.

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Y. S. Tsai, S. H. Wang, F. S. Juang, S. Y. Su, M. H. Chang, T. E. Hsieh, and M. O. Liu "Efficiency improvement of flexible phosphorescent organic light emitting diode by inserting a buffer layer", Proc. SPIE 6891, Organic Photonic Materials and Devices X, 68911A (12 February 2008); https://doi.org/10.1117/12.790932

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