荧光亚单层结合磷光掺杂层制备白色有机发光器件

杨惠山

doi:doi:10.3788/aos201333.0323005

光学学报, 2013, 33 (3): 0323005, 网络出版: 2013-02-06

荧光亚单层结合磷光掺杂层制备白色有机发光器件

Fabrications of White Organic Light-Emitting Device Based on Fluorescent Sub-Monolayer Combine with Phosphorescent Doping Layer

论文大纲

杨惠山 ^*

作者单位

泉州师范学院物理与信息工程学院, 福建泉州 362000

光学器件白色有机发光器件亮度效率亚单层 optical devices white organic light-emitting device luminance efficiency sub-monolayer

摘要

以4,4′-二(2,2)-二苯乙烯基-1,1联苯(DPVBi)为蓝光发光层，将荧光材料2-(4-二苯基)-5-(4-叔丁)(DCM2)以亚单层的方式插入DPVBi后作为红光发光层，将绿光三(2-苯基吡啶)铱磷光染料掺入到母体4,4′-N,N′-dicarbazole-biphenyl(CBP)中作为绿光发光层，制备了一种荧光与磷光相结合的白色有机电致发光器件(WOLED)。器件结构为ITO/NPB（40 nm ）/DPVBi (8 nm)/DCM2(d)/CBPIr(ppy)3 8% (15 nm)/4,7-diphenyl-1,10-phenanthroline(BPhen) (60 nm)/LiF (1 nm)/Al (200 nm)，通过改变亚单层的厚度，得到了高效率的WOLED，当亚单层厚度为0.05 nm时，器件的最大电流效率可达7.60 cd/A，当电压为13 V时亮度达15420 cd/m2，当电压从4 V变化到12 V时，色坐标从(0.34,0.44)变化到(0.27,0.33)。为了进一步提高器件的性能，在红光和绿光发光层间加入激子阻挡层BPhen，当其厚度为5 nm时，电流效率达到10.56 cd/A，亮度在电压为13 V时达到25960 cd/m2，当电压从4 V变化到12 V时，色坐标从(0.34,0.44)变化到(0.28,0.36)，处于白光区。结果表明，加入激子阻挡层BPhen后，器件的光谱和色坐标仍相对稳定，器件性能得到提高，获得了色稳定性较好的白光器件。

Abstract

White organic light-emitting device (WOLED) based on fluorescent sub-monolayer combining with phosphorescent doping layer is fabricated, in which fluorescent material 4,4′-bis(2,2′-diphenyl vinyl)-1,1′-biphenyl (DPVBi) acts as blue emitter layer, sub-monolayer ［2-methyl-6- ［2-(2, 3, 6, 7-tetrahydro-1H, 5H-benzo［ij］ quinolizin-9-yl) ethenyl］-4H-pyran-4-ylidene］ propane-dinitrile (DCM2) inserted in the blue emitter layer acts as red emitter layer, fac tris (2-phenylpyridine) iridium ［Ir(ppy)3］ doped into 4,4′-N,N′-dicarbazole-biphenyl(CBP) host acts as green emitter layer, respectively. The structure of device is ITO / NPB（40 nm ）/DPVBi (8 nm) /DCM2(d)/CBPIr(ppy)3 8% (15 nm)/4, 7 -diphenyl-1, 10-phenanthroline (BPhen) (60 nm)/LiF (1 nm)/Al (200 nm). The device performance is controlled by varying the thickness of DCM2. The maximum current efficiency and maximum luminance of the device with the DCM2 thickness of 0.05 nm DCM2 are 7.60 cd/A, 15 420 cd/m2, respectively. The commission international eclairage (CIE) color coordinates of the device vary from (0.34, 0.44) at 4 V to (0.27, 0.33) at 12 V. In order to further improve the performance of WOLED, the BPhen is used as exciton block-layer to the WOLED, the maximum current efficiency and maximum luminance of the device with BPhen thickness of 5 nm are 10.56 cd/A at 4 V, 25960 cd/m2 at 13 V, respectively. The CIE color coordinates of the device vary from (0.34, 0.44) at 4 V to (0.28, 0.36) at 12 V that are general within the white region. The results show that, compared with that of without exciton block- layer, the devices employing exciton block-layer yield higher device performance as well as comparatively stable electroluminescence spectra and CIE color coordinates results stable white emission.

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杨惠山. 荧光亚单层结合磷光掺杂层制备白色有机发光器件[J]. 光学学报, 2013, 33(3): 0323005. Yang Huishan. Fabrications of White Organic Light-Emitting Device Based on Fluorescent Sub-Monolayer Combine with Phosphorescent Doping Layer[J]. Acta Optica Sinica, 2013, 33(3): 0323005.

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