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Proceedings Paper

Efficiency improvement of flexible phosphorescent organic light emitting diode by inserting a buffer layer
Author(s): Y. S. Tsai; S. H. Wang; F. S. Juang; S. Y. Su; M. H. Chang; T. E. Hsieh; M. O. Liu
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Paper 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.

Paper Details

Date Published: 12 February 2008
PDF: 6 pages
Proc. SPIE 6891, Organic Photonic Materials and Devices X, 68911A (12 February 2008); doi: 10.1117/12.790932
Show Author Affiliations
Y. S. Tsai, National Formosa Univ. (Taiwan)
S. H. Wang, National Formosa Univ. (Taiwan)
F. S. Juang, National Formosa Univ. (Taiwan)
S. Y. Su, National Formosa Univ. (Taiwan)
M. H. Chang, Industrial Technology Research Institute (Taiwan)
T. E. Hsieh, National Chiao-Tung Univ. (Taiwan)
M. O. Liu, Industrial Technology Research Institute (Taiwan)

Published in SPIE Proceedings Vol. 6891:
Organic Photonic Materials and Devices X
Robert L. Nelson; Francois Kajzar; Toshikuni Kaino, Editor(s)

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