将磷光客体掺入PVK:PBD主体材料中是获得高效率磷光电致发光器件(PhPLED)的有效途径.然而,分别掺杂Ir(pppy)3、Ir(F-pppy)3和Ir(F2-ppPY)3三种磷光客体的PhPLED器件性能件却显著不同.我们分别模拟主-客体间能量转移和客体直接捕获电子空穴对两种机制,研究了三种客体材料的磷光发射及其衰减过程.研究表明:平衡的载流子注入和客体高效率的载流子捕获是实现Ir配合物掺杂的PhPLED器件性能优良的主要机制,PVK较低的三重态能级使其无法成为蓝光磷光电致发光器件的主体,在PVK中掺入PBD的方法,则进一步降低了主体材料的三重态能级,这是蓝光磷光电致发光器件运行效率较低的主要原因.本文的研究结果可为高分子磷光电致发光器件的制备技术和新型磷光主体的设计提供参考.
参考文献
| [1] | Baldo M A;O'Brien D F;You Y et al.Highly efficient phosphorescent emission from organic electro-luminescent devices[J].Nature,1998,395:151-154. |
| [2] | Chihaya Adachi;Marc A. Baldo;Mark E. Thompson;Stephen R. Forrest .Nearly 100% internal phosphorescence efficiency in an organic light emitting device[J].Journal of Applied Physics,2001(10):5048-5051. |
| [3] | Masamichi Ikai;Shizuo Tokito;Youichi Sakamoto;Toshiyasu Suzuki;Yasunori Taga .Highly efficient phosphorescence from organic light-emitting devices with an exciton-block layer[J].Applied physics letters,2001(2):156-158. |
| [4] | 刘红梅,郑才俊,何鉴,张晓宏.高效溶液法小分子磷光电致发光器件研究[J].影像科学与光化学,2008(01):8-15. |
| [5] | 张建成;王夺元.现代光化学[M].北京:化学工业出版社,2006:21-24. |
| [6] | Noh Y Y;Lee C L;Kim J J et al.Energy transfer and device performance in phosphorescent dye doped polymer light emitting diodes[J].Journal of Chemical Physics,2003,118:2853. |
| [7] | Chen F C;He G;Yang Y .Triplet exciton confinement in phosphorescent polymer light-emitting diodes[J].Applied Physics Letters,2003,82:1006-1008. |
| [8] | Chen FC.;Chang SC.;He GF.;Pyo S.;Yang Y.;Kurotaki M.;Kido J. .Energy transfer and triplet exciton confinement in polymeric electrophosphorescent devices[J].Journal of Polymer Science, Part B. Polymer Physics,2003(21):2681-2690. |
| [9] | Simon M K;Hameed A A;Rebecca J E et al.The influence of triplet transfer and other factors on enhancing device performance[J].Advanced Functional Materials,2006,16:1043-1050. |
| [10] | Yang X H;Neher D .Polymer electrophosphorescence devices with high power conversion efficiencies[J].Applied Physics Letters,2004,84:2476. |
| [11] | Liu H M;He J;Wang P F et al.High-efficiency polymer electrophosphorescent diodes based on an Ir(Ⅲ) complex[J].Applied Physics Letters,2005,87:221103. |
| [12] | Liu HM;Wang PF;He J;Zheng C;Zhang XH;Chew SL;Lee CS;Chang J;Lee ST .High-efficiency endothermic energy transfer in polymeric light-emitting devices based on cyclometalated Ir complexes[J].Applied physics letters,2008(2):23301-1-23301-3-0. |
| [13] | Blue organic electrophosphorescence using exothermic host-guest energy transfer[J].Applied physics letters,2003(15):2422-2424. |
| [14] | Kadashchuk, A;Schols, S;Vakhnin, A;Genoe, J;Heremans, P .Triplet dynamics and charge carrier trapping in triplet-emitter doped conjugated polymers[J].Chemical Physics: A Journal Devoted to Experimental and Theoretical Research Involving Problems of Both a Chemical and Physical Nature,2009(1/2):147-155. |
| [15] | Llorente A G;Arredondo B;Romero B .Energy transfer within mixed phase polyfluorene based phosphorescent electroluminescent devices[J].Journal of Physical Chemistry C,2012,116(06):4259-4266. |
| [16] | Chew S L;Lee C S;Lee S T et al.Photoluminescence and electroluminescence of a new blue-emitting homoleptic iridium complex[J].Applied Physics Letters,2006,88:093510. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%