Improved blue light-emitting polymeric device by the tuning of drift mobility and charge balance

Authors
Chin, BDSuh, MCLee, STChung, HKLee, CH
Issue Date
2004-03-08
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.84, no.10, pp.1777 - 1779
Abstract
We have prepared blue polymer-small molecule hybrid electroluminescence devices with improved efficiency and lower driving voltage by the statistical design method. Analysis of time-of-flight measurement shows that amorphous small molecule hole-transporter blended with a blue light-emitting polymer increases the field-dependent hole mobility, with transition from nondispersive to dispersive transport induced by the charge-trapping effect. Moreover, at the electroluminescent devices with different electron injection/transport layer (LiF/Al, LiF/Ca/Al, and Alq(3)/LiF/Al), efficiency was further increased. We have analyzed that carrier mobility of a multilayered device can also be controlled by the change of electron injection and transport layers. We find that structural design and matching overall charge balance is an essential factor to improve both the operating voltage and efficiency of existing blue polymer devices. (C) 2004 American Institute of Physics.
Keywords
HOLE TRANSPORT; SINGLE-LAYER; ELECTROLUMINESCENCE; DIODE; HOLE TRANSPORT; SINGLE-LAYER; ELECTROLUMINESCENCE; DIODE; OLED; Charge Mobility; Time of Flight
ISSN
0003-6951
URI
https://pubs.kist.re.kr/handle/201004/137767
DOI
10.1063/1.1651644
Appears in Collections:
KIST Article > 2004
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