Controlled light emission from white organic light-emitting devices with a single blue-emitting host and multiple fluorescent dopants

In this work, we fabricated white organic light-emitting devices (WOLEDs) containing a layered light-emitting region composed of a single blue-emitting host and different fluorescent dopant materials. The effects of varying the dye-doping ratio and emitting layer thickness on the efficiency, lifetime, spectral voltage-dependence and white balance were investigated for devices with a blue/orange stacked layer structure. Addition of a blue host layer doped with a green-emitting dopant, to give a blue/green/orange emitter, resulted in a broadband white spectrum without the need for a charge-blocking interlayer. The composition of blue, green and orange dopants in the host and the thickness of each emitting layer were optimized, resulting in a device efficiency of 9-11 cd A(-1) even at a high brightness of 10 000 cd m(-2) (achieved at a bias voltage of less than 9V) with an emission spectrum suitable for lighting applications.
Publisher
IOP PUBLISHING LTD
Issue Date
2007-08
Language
ENG
Keywords

LAYER; DIODES; HOLE

Citation

JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.40, no.15, pp.4436 - 4441

ISSN
0022-3727
DOI
10.1088/0022-3727/40/15/008
URI
http://hdl.handle.net/10203/4329
Appears in Collection
CBE-Journal Papers(저널논문)
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