Blue top-emitting organic light-emitting devices using Alq3 as phase shift adjustment layer
Yan-long Meng, Wen-fa Xie, Guo-hua Xie, Feng-min Wu, Yi Zhao, Jing-ying Hou, Shi-yong Liu
Optoelectronics Letters ›› 2011, Vol. 7 ›› Issue (2) : 126-128.
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 Alq3 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 CIEx,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/m2. Compared with adjusting the total thickness of organic layer, it is more beneficial for achieving blue TEOLEDs with high efficiency.
Phase Shift / Resonance Wavelength / Resonant Wavelength / Metallic Electrode / Triphenylamine
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