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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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Published in: | Optoelectronics letters 2011-03, Vol.7 (2), p.126-128 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 1673-1905 1993-5013 |
DOI: | 10.1007/s11801-011-0110-3 |