TITLE

White organic light-emitting diodes based on 2,7-bis(2,2-diphenylvinyl)-9,9′-spirobifluorene: Improvement in operational lifetime

AUTHOR(S)
Chuen, C.H.; Tao, Y.T.; Wu, F.I.; Shu, C.F.
PUB. DATE
November 2004
SOURCE
Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4609
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Very bright white organic light-emitting diodes were fabricated using 2,7-his(2,2-diphenylvinyl)-9,9'-spirobifluorene (DPVSBF) doped with [4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran)] (DCJTB) as the emission layer. With a device configuration of ITO/NPB(40 nm)/DPVSBF:0.2%DCJTB(11 nm)/Alq(30 nm)/LiF(1 nm)/Al(150 nm), a brightness of 1575 cd/m² with an external quantum efficiency of 3.31% and luminous efficiency of 8.00 cd/A, a power efficiency of 5.35 lm/W was achieved at a driving current of 20 mA/cm² (4.7 V). The brightness reached 66 000 cd/m² at 15 V. The Commission Internationale de l'Eelairage coordinates stayed nearly constant, changed from (0.35, 0.36) to (0.32, 0.34) when the voltage increased from 6 to 12 V. The relative operational lifetime of the device increased by a factor of ∼20 compared with a similar device based on 4,4'-his-(2,2-diphenylvinyl)-1,1'-biphenyl as the source of the blue emission. The much extended half-lifetime was attributed to the higher morphological stability of the DPVSBF.
ACCESSION #
15075083

 

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