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Blue top-emitting organic light-emitting devices using Alq3 as phase shift adjustment layer

Blue top-emitting organic light-emitting devices (TEOLEDs) are demonstrated by employing Alq 3 as phase shift adjustment layer (PSAL) to increase the phase shift on reflection of the top electrode within a range, which also improves the light out-coupling. By adjusting the thickness of PSAL, the CIE...

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Bibliographic Details
Published in:Optoelectronics letters 2011-03, Vol.7 (2), p.126-128
Main Authors: Meng, Yan-long, Xie, Wen-fa, Xie, Guo-hua, Wu, Feng-min, Zhao, Yi, Hou, Jing-ying, Liu, Shi-yong
Format: Article
Language:English
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Summary:Blue top-emitting organic light-emitting devices (TEOLEDs) are demonstrated by employing Alq 3 as phase shift adjustment layer (PSAL) to increase the phase shift on reflection of the top electrode within a range, which also improves the light out-coupling. By adjusting the thickness of PSAL, the CIE x,y of devices, which utilize 2, 7-Di-pyrenyl-9, 9-spiro-bifluorene (DPSF) as emitting layer, changes from (0.16, 0.50) to (0.18, 0.37). The maximum current efficiency of 7.1 cd/A is acquired under 4.5 V with an increasing luminance of 139 cd/m 2 . Compared with adjusting the total thickness of organic layer, it is more beneficial for achieving blue TEOLEDs with high efficiency.
ISSN:1673-1905
1993-5013
DOI:10.1007/s11801-011-0110-3