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Proceedings Paper

High efficiency phosphorescent OLEDs based on the heterostructured light emission and charge injection layers
Author(s): Byung Doo Chin; Yuri Choi; Heume-Il Baek; Changhee Lee
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Paper Abstract

The light emitting efficiency and the stability of the phosphorescent devices, whose emission characteristics are strongly dominated not only by the energy transfer but also by the charge carrier trapping influenced by the heterostructured emissive layers and charge injection layer, are studied in terms of the charge injection behavior, carrier transporting mobility, and balancing of devices. The enhancement of the light emitting properties (higher efficiency and lower driving voltage) by use of heterostructures at emitting layer, either multilayers or mixing of hole- and electron-transporting materials (such as 4,4",4"-tris(N-carbazolyl)-triphenylamine); TCTA and bis(10-hydroxybenzo[h]quinolinate) beryllium; Bebq2) was characterized. By a design of emitting layer structure for recombination, 30~50lm/W efficiency of devices with Ir(ppy)3 and conventional transporting layer was possible.

Paper Details

Date Published: 27 August 2009
PDF: 8 pages
Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 741510 (27 August 2009); doi: 10.1117/12.828952
Show Author Affiliations
Byung Doo Chin, Dankook Univ. (Korea, Republic of)
Yuri Choi, Korea Institute of Science and Technology (Korea, Republic of)
Heume-Il Baek, Seoul National Univ. (Korea, Republic of)
Changhee Lee, Seoul National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7415:
Organic Light Emitting Materials and Devices XIII
Franky So; Chihaya Adachi, Editor(s)

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