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自旋极化有机电致发光器件中单线态与三线态激子的形成及调控
引用本文:乔士柱,赵俊卿,贾振锋,张宁玉,王凤翔,付刚,季燕菊.自旋极化有机电致发光器件中单线态与三线态激子的形成及调控[J].物理学报,2010,59(5):3564-3570.
作者姓名:乔士柱  赵俊卿  贾振锋  张宁玉  王凤翔  付刚  季燕菊
作者单位:山东建筑大学理学院,济南,250101
基金项目:国家自然科学基金(批准号:60676041),山东省自然科学基金(批准号:Y2006A18)和山东建筑大学校内基金重点项目(批准号:XZ050102)资助的课题.
摘    要:由于有机半导体(OSC)材料自旋弛豫时间长、自旋扩散长度大,OSC自旋器件逐渐成为研究热点.对于有机电致发光器件(OLED),通过自旋极化电极调控单线态和三线态激子比率是提高其效率的有效方法.本文从漂移扩散方程和载流子浓度连续性方程出发,结合朗之万定律建立了一个自旋注入、输运、复合的理论模型.计算了OSC中的极化电子、空穴浓度,得出了单线态和三线态激子的比率.分析了电场强度、自旋相关界面电导、电极和OSC电导率匹配和电极极化率等因素的影响.计算结果表明:两电极注入反向极化的载流子并提高载流子自旋极化率,有

关 键 词:有机电致发光器件,  自旋极化注入,  载流子复合,  单线态/三线态比率
收稿时间:8/4/2009 12:00:00 AM

Formation and manipulation of singlet and triplet in spin-polarized organic light-emitting devices
Qiao Shi-Zhu,Zhao Jun-Qing,Jia Zhen-Feng,Zhang Ning-Yu,Wang Feng-Xiang,Fu Gang,Ji Yan-Ju.Formation and manipulation of singlet and triplet in spin-polarized organic light-emitting devices[J].Acta Physica Sinica,2010,59(5):3564-3570.
Authors:Qiao Shi-Zhu  Zhao Jun-Qing  Jia Zhen-Feng  Zhang Ning-Yu  Wang Feng-Xiang  Fu Gang  Ji Yan-Ju
Abstract:Organic semiconductor (OSC) devices based on manipulation of electron spin have attracted considerable attention since the discovery of long spin relaxation time and large transport distance in OSCs. For organic light-emitting devices (OLEDs), controlling the singlet to triplet ratio by spin-polarized electrodes is one of the effective ways to realize high luminescent efficiency. Based on the drift-diffusion equation, continuous equation and Langevin recombination theory, the spin injection, transportation and recombination properties of carriers in OLEDs are modeled in this paper. The density of polarized electrons and holes in OSCs are calculated, the singlet to triplet ratio is analyzed, and the influences of the electrical field, spin-related interfacial conductance, bulk conductivity and polarization of electrodes are accounted for. It is showed that opposite spin polarization of electrons and holes are in favor of increasing singlet to triplet ratio, and the higher spin polarization of injected carrier density is, the larger singlet to triplet ratio will be. Large spin-related interfacial resistance, large polarization of electrodes, matched bulk conductivity and high electrical field under forward bias favor spin polarization of carries density in OSCs. We can obtain obviously improved density polarization by optimizing the related parameters on the basis of essential injection efficiency. The optimized polarization ensures sufficient space for manipulating singlet to triplet ratio, hence the quantum efficiency of OLEDs.
Keywords:organic light-emitting devices  spin-polarized injection  carriers recombination  singlet to triplet ratio
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