12 February 2008 Efficiency improvement of flexible phosphorescent organic light emitting diode by inserting a buffer layer
Author Affiliations +
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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Y. S. Tsai, Y. S. Tsai, S. H. Wang, S. H. Wang, F. S. Juang, F. S. Juang, S. Y. Su, S. Y. Su, M. H. Chang, M. H. Chang, T. E. Hsieh, T. E. Hsieh, M. O. Liu, 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); doi: 10.1117/12.790932; https://doi.org/10.1117/12.790932
PROCEEDINGS
6 PAGES


SHARE
Back to Top