發(fā)布時間：2018-01-07 18:17

  本文關鍵詞：紅熒烯發(fā)光器件中電流與溫度調(diào)控的微觀演化過程　出處：《中國科學:技術科學》2017年09期 　論文類型：期刊論文

  更多相關文章： 磁效應 單重態(tài)激子分裂 三重態(tài)激子湮滅 系間竄越

【摘要】：有機發(fā)光磁效應對有機半導體中激發(fā)態(tài)的微觀過程有指紋式響應,本文采用這一靈敏方法探究了紅熒烯(Rubrene)發(fā)光器件中微觀機制隨電流與溫度的演化.實驗結(jié)果表明:室溫下,注入較小電流(5~100μA)時,Rubrene中主要發(fā)生單重態(tài)激子的分裂(singlet fission,SF),且該過程幾乎不受電流變化的影響;注入中等電流(100~1000μA)時,除發(fā)生SF外,由直接注入的三重態(tài)激子還可以發(fā)生聚合反應(triplet fusion,TF);注入大電流(1000~4500μA)時,除了SF和TF,還出現(xiàn)了系間竄越過程(inter-system crossing,ISC).從室溫到20 K的降溫過程中,SF變?nèi)?TF增強,ISC過程也越來越強.本器件中ISC隨電流與溫度的演化規(guī)律均與常規(guī)發(fā)光器件中的規(guī)律相反.我們采用相關微觀過程的率常數(shù)以及不同電流和溫度下激發(fā)態(tài)的壽命對實驗結(jié)果進行了較好解釋,這對深入理解Rubrene在有機發(fā)光中的微觀機制有一定的促進作用.
[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.
【作者單位】： 西南大學物理科學與技術學院;
【基金】：國家自然科學基金(批準號:11374242) 中央高校基本科研業(yè)務費專項資金(批準號:XDJK2017D141)資助項目
【分類號】：TN383
【正文快照】： 1引言.紅媻■(Rubrene).h熞恢指綣惴喊嚶，

本文編號：1393692