Efficiency enhancement of 1,1,2,3,4,5-hexaphenylsilole-based organic light-emitting dioades by post-packaging annealing

Author

Sun, J.X. ; Zhu, X.L. ; Dong, Y.Q. ; Tang, B.Z. ; Kwok, H.S.

Author_Institution

Center for Display Res. & EEE Dept., Hong Kong Univ. of Sci. & Technol., Kowloon

fYear

2005

fDate

24-25 Dec. 2005

Firstpage

1

Lastpage

4

Abstract

Organic light-emitting diodes based on the emission of 1,1,2,3,4,5-hexaphenylsilole (HPS) peaking at ~492nm have been fabricated and experienced post-packaging annealing in oven at 70degC for 5 hours. The electroluminescent (EL) characteristics were measured and compared in between the devices with and without annealing. The turn-on voltage (defined as the voltage to require 1 cd/m²), luminous efficiency and power efficiency of devices were much improved after this thermal treatment. Crystallization of the HPS film due to annealing and therefore the photoluminescence (PL) quantum yield (Oslash_PL) enhancement and electron mobility increase there of were proposed as the main factors accounting for the EL performance improvement

Keywords

annealing; crystallisation; electroluminescence; electron mobility; organic light emitting diodes; photoluminescence; thin films; 1,1,2,3,4,5-hexaphenylsilole-based organic light-emitting diodes; 5 hrs; 70 C; HPS film; crystallization; electroluminescent characteristics; electron mobility; luminous efficiency; photoluminescence quantum yield enhancement; post-packaging annealing; power efficiency; thermal treatment; Annealing; Crystallization; Electron mobility; Flat panel displays; Fluorescence; Indium tin oxide; Organic light emitting diodes; Organic materials; Ovens; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

9th International Multitopic Conference, IEEE INMIC 2005

Conference_Location

Karachi

Print_ISBN

0-7803-9429-1

Electronic_ISBN

0-7803-9430-5

Type

conf

DOI

10.1109/INMIC.2005.334418

Filename

4133433