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, Tsung-Eong Hsien, M. O. Liu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publicationOrganic Photonic Materials and Devices X
DOIs
StatePublished - 21 Apr 2008
EventOrganic Photonic Materials and Devices X - San Jose, CA, United States
Duration: 22 Jan 200824 Jan 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6891
ISSN (Print)0277-786X

Conference

ConferenceOrganic Photonic Materials and Devices X
CountryUnited States
CitySan Jose, CA
Period22/01/0824/01/08

Keywords

  • Lifetime
  • Luminance efficiency
  • Organic light emitting diode
  • Phosphorescent
  • Spin-coating

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