以有机电致磷光器件ITO/NPB/CBP+ Ir(ppy) 3/LiF/A1为研究对象,在该器件中,CBP(4,4'-N,N'-二咔唑联苯)为主体材料,Ir(ppy)3(三(2-苯基吡啶)铱)为磷光掺杂剂,NPB为空穴传输层.然后在参考器件的NPB/CBP+ Ir(ppy)3界面处构建了凹凸结构,制备了一系列凹凸发光层的磷光器件.通过电流密度-电压-亮度曲线、电流效率-电压曲线考察了不同凹凸发光层磷光器件的电致发光性能,并分析了这些器件的界面电荷俘获以及注入电荷动力学.研究结果发现,当凸起个数为3个时,器件的最大电流效率为22 cd/A,与传统结构器件相比提高了26％.电流效率的提高主要归结于以下两个原因:一方面,凹凸结构拓宽了载流子复合界面的面积,从而减弱了三线态激子-三线态激子的淬灭;另一方面,凹凸结构有利于减弱器件的光波导效应,增强器件内部的光耦合输出效率.
参考文献
| [1] | Tang C W;Vanslyke S A .Organic Electroluminescent Diodes[J].Applied Physics Letters,1987,51:913-915. |
| [2] | Song M H;Kabra D;Wenger B et al.Optically-Pumped Lasing in Hybrid Organic-Inorganic Light-Emitting Diodes[J].Advanced Functional Materials,2009,19:2 130-2 132. |
| [3] | Yook, KS;Jeon, SO;Joo, CW;Lee, JY .High efficiency deep blue phosphorescent organic light-emitting diodes[J].Organic electronics,2009(1):170-173. |
| [4] | Huang J;Qiso X F;Xia Y J et al.A Dithienylbenzothiadiazole Pure Red Molecular Emitter with Electron Transport and Exciton Self-Confinement for Nondoped Organic Red-Light-Emitting Diodes[J].Advanced Materials,2008,20:4 172-4 173. |
| [5] | Hen L L;Yang D F;Li W L et al.Intramolecular Energy Transfer Between the Triplet of Ancillary Ligand and the Metal to Ligand Charge Transfer State Existed in Heterocyclometalated Iridium (Ⅲ) Complexes Source[J].Applied Physics Letters,2009,94:163 303. |
| [6] | D' Andrade B .Lighting:White Phosphorescent OLEDs Offer Efficient Answer[J].Nat Photonics,2007(1):33-35. |
| [7] | Hao Yuying;Lei Junfeng;Fang Xiaohong;Fan Wenhao;Xu Bingshe .Theoretical studies on geometrical and electronic structure of electroplex at the NPB/PBD interface in organic light-emitting diodes[J].Current applied physics: the official journal of the Korean Physical Society,2010(3):744-748. |
| [8] | Loy D E;Koene B E;Thompson M E .Thermally Stable HoleTransporting Materials Based upon a Fluorene Core[J].Advanced Functional Materials,2002,12:245-247. |
| [9] | Sebastian R;Frank L;Schwartz G et al.White Organic LightEmitting Diodes Mth Fluorescent Tube Efficiency[J].NATURE,2009,459:234. |
| [10] | Papadimitrakopoulos F;Zhang X M;Thomsen D L et al.A Chemical Failure Mechanism for Aluminum(Ⅲ) 8-Hydroxyquinolinelight-Emitting Devices[J].Chemistry of Materials,1996,8(7):1 363-1 365. |
| [11] | Adachi C;Baldo M A;Thompson M E.Nearly 100％ Internal Phosphorescence Efficiency in an Organic Light-Emitting Device[J].Journal of Applied Physics,2001:5 048-5 051. |
| [12] | J. Lee;Y. Park;D. Y. Kim;H. Y. Chu;H. Lee;L.-M. Do .High efficiency organic light-emitting devices with Al/NaF cathode[J].Applied physics letters,2003(2):173-175. |
| [13] | Liao, LS;Slusarek, WK;Hatwar, TK;Ricks, ML;Comfort, DL .Tandem organic light-emitting mode using hexaazatriphenylene hexacarbonitrile in the intermediate connector[J].Advanced Materials,2008(2):324-329. |
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