红荧烯发光器件中电流与温度调控的微观演化过程

发布时间：2018-01-07 18:17

  本文关键词：红荧烯发光器件中电流与温度调控的微观演化过程　出处：《中国科学:技术科学》2017年09期 　论文类型：期刊论文

  更多相关文章： 磁效应 单重态激子分裂 三重态激子湮灭 系间窜越

【摘要】：有机发光磁效应对有机半导体中激发态的微观过程有指纹式响应,本文采用这一灵敏方法探究了红荧烯(Rubrene)发光器件中微观机制随电流与温度的演化.实验结果表明:室温下,注入较小电流(5~100μA)时,Rubrene中主要发生单重态激子的分裂(singlet fission,SF),且该过程几乎不受电流变化的影响;注入中等电流(100~1000μA)时,除发生SF外,由直接注入的三重态激子还可以发生聚合反应(triplet fusion,TF);注入大电流(1000~4500μA)时,除了SF和TF,还出现了系间窜越过程(inter-system crossing,ISC).从室温到20 K的降温过程中,SF变弱,TF增强,ISC过程也越来越强.本器件中ISC随电流与温度的演化规律均与常规发光器件中的规律相反.我们采用相关微观过程的率常数以及不同电流和温度下激发态的寿命对实验结果进行了较好解释,这对深入理解Rubrene在有机发光中的微观机制有一定的促进作用.
[Abstract]:The magnetic effect of organic luminescence has a fingerprint response to the microscopic process of excited states in organic semiconductors. This sensitive method has been used to investigate the evolution of micromechanism with current and temperature in red fluorine Rubrene-based luminescent devices. The experimental results show that: at room temperature. The single state excitons are mainly observed in Rubrene at a low current of 100 渭 A (100 渭 A). And the process is almost unaffected by the change of current. When the medium current is 100 渭 A), besides SF, the directly implanted triplet excitons can also produce the polymerization reaction triplet fusionsTFN. In addition to SF and TFFs, inter-system crossing occurred in addition to SF and TFFs. During the cooling process from room temperature to 20 K, SF becomes weaker and TF increases. The evolution law of ISC with current and temperature in this device is contrary to that in conventional luminescent device. We use the rate constant of related microscopic process and excitation at different current and temperature. The experimental results are well explained by the lifetime of the state. This can promote the understanding of the microscopic mechanism of Rubrene in organic luminescence.
【作者单位】： 西南大学物理科学与技术学院;
【基金】：国家自然科学基金(批准号:11374242) 中央高校基本科研业务费专项资金(批准号:XDJK2017D141)资助项目
【分类号】：TN383
【正文快照】： 1引言.红媻■(Rubrene).h熞恢指绻惴喊嘤，

本文编号：1393692