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Improved performance of organic light-emitting diodes with dual electron transporting layers 下载免费PDF全文
In this study the performance of organic light-emitting diodes(OLEDs) are enhanced significantly,which is based on dual electron transporting layers(Bphen/CuPc).By adjusting the thicknesses of Bphen and CuPc,the maximal luminescence,the maximal current efficiency,and the maximal power efficiency of the device reach 17570 cd/m2 at 11 V,and 5.39 cd/A and 3.39 lm/W at 3.37 mA/cm2 respectively,which are enhanced approximately by 33.4%,39.3%,and 68.9%,respectively,compared with those of the device using Bphen only for an electron transporting layer.These results may provide some valuable references for improving the electron injection and the transportation of OLED. 相似文献
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Efficiency of a blue organic light-emitting diode enhanced by inserting charge control layers into the emission region 下载免费PDF全文
We demonstrate high current efficiency of a blue fluorescent organic light-emitting diode (OLED) by using the charge control layers (CCLs) based on Alq3 . The CCLs that are inserted into the emitting layers (EMLs) could impede the hole injection and facilitate the electron transport, which can improve the carrier balance and further expand the exciton generation region. The maximal current efficiency of the optimal device is 5.89 cd/A at 1.81 mA/cm2 , which is about 2.19 times higher than that of the control device (CD) without the CCL, and the maximal luminance is 19.660 cd/m2 at 12V. The device shows a good color stability though the green light emitting material Alq3 is introduced as the CCL in the EML, but it has a poor lifetime due to the formation of cationic Alq3 species. 相似文献
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Low driving voltage in an organic light-emitting diode using MoO3/NPB multiple quantum well structure in a hole transport layer 下载免费PDF全文
The driving voltage of an organic light-emitting diode(OLED) is lowered by employing molybdenum trioxide(MoO3)/N,N’-bis(naphthalene-1-yl)-N,N’-bis(phe-nyl)-benzidine(NPB) multiple quantum well(MQW) structure in the hole transport layer.For the device with double quantum well(DQW) structure of ITO/[MoO3(2.5 nm)/NPB(20 nm)]2/Alq3(50 nm)/LiF(0.8 nm)/Al(120 nm)],the turn-on voltage is reduced to 2.8 V,which is lowered by 0.4 V compared with that of the control device(without MQW structures),and the driving voltage is 5.6 V,which is reduced by 1 V compared with that of the control device at the 1000 cd/m2.In this work,the enhancement of the injection and transport ability for holes could reduce the driving voltage for the device with MQW structure,which is attributed not only to the reduced energy barrier between ITO and NPB,but also to the forming charge transfer complex between MoO3 and NPB induced by the interfacial doping effect of MoO3. 相似文献
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本文利用色转换方法,将高效的蓝色柔性有机电致发光器件(flexible organic light emitting devices, FOLEDs)与色转换材料(color conversion material, CCM)相结合,制备了柔性白色有机电致发光器件(white organic light emitting devices, WOLEDs).首先利用2, 3, 5, 6-Tetrafluoro-7, 7, 8, 8-tetracyano-quinodimethane (F4-TCNQ)和4, 4', 4"-tris-(N-3-methylphenyl-N-phenylamino) tripheny-lamine (m-MTDATA)组成的多量子阱(multiple quantum well, MQW)结构作为空穴注入层(hole injection layer, HIL)结合新型蓝光材料N6, N6, N12, N12-tetrap-tolylchrysene-6, 12-diamine (NCA)制备出高效的蓝光FOLEDs,然后将其与色转换材料4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) 结合,通过沉积不同厚度的CCM来优化白光器件的发光光谱,获得了色稳定性较高的白光. 实验结果表明:在驱动电压为7 V, DCJTB的厚度为120 nm时得到较接近白光等能点的色坐标 (0.33, 0.27),且当驱动电压由6 V升至11 V 时,器件的色坐标变化仅为(±0.02, ±0.02), 表现出高色稳定性. 相似文献
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