Share Email Print

Proceedings Paper

Improved hole-injection and power efficiency of organic light-emitting diodes using an ultrathin cerium fluoride buffer layer
Author(s): Hsin-Wei Lu; Po-Ching Kao; Sheng-Yuan Chu
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

In this study, the efficiency of organic light-emitting diodes (OLEDs) was enhanced by depositing a CeF3 film as an ultra-thin buffer layer between the ITO and NPB hole transport layer, with the structure configuration ITO/CeF3 (1 nm)/NPB (40 nm)/Alq3 (60 nm)/LiF (1 nm)/Al (150 nm). The enhancement mechanism was systematically investigated via several approaches. The work function increased from 4.8 eV (standard ITO electrode) to 5.2 eV (1-nm-thick UV-ozone treated CeF3 film deposited on the ITO electrode). The turn-on voltage decreased from 4.2 V to 4.0 V at 1 mA/cm2, the luminance increased from 7588 cd/m2 to 10820 cd/m2, and the current efficiency increased from 3.2 cd/A to 3.5 cd/A when the 1-nm-thick UV-ozone treated CeF3 film was inserted into the OLEDs.

Paper Details

Date Published: 23 September 2016
PDF: 7 pages
Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 994124 (23 September 2016); doi: 10.1117/12.2237242
Show Author Affiliations
Hsin-Wei Lu, National Cheng Kung Univ. (Taiwan)
Po-Ching Kao, National Chiayi Univ. (Taiwan)
Sheng-Yuan Chu, National Cheng Kung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9941:
Organic Light Emitting Materials and Devices XX
Franky So; Chihaya Adachi; Jang-Joo Kim, Editor(s)

© SPIE. Terms of Use
Back to Top