本文選題：紅熒烯　切入點(diǎn)：超小磁場　出處：《中國科學(xué):技術(shù)科學(xué)》2017年01期 　論文類型：期刊論文

【摘要】：制備了基于5,6,11,12-tetraphenylnaphthacene(Rubrene)的有機(jī)發(fā)光二極管,并測量器件在不同偏壓與工作溫度下電致發(fā)光的磁場效應(yīng)(magneto-electroluminescence,MEL).實(shí)驗(yàn)發(fā)現(xiàn):在室溫下,MEL曲線在零磁場附近幾毫特斯拉范圍內(nèi)為W線型;而當(dāng)溫度降低到75 K左右,該W線型消失,MEL卻呈現(xiàn)出一種新的精細(xì)結(jié)構(gòu),即M型的超小場效應(yīng),這種演化過程在以前的文獻(xiàn)中未見報道.分析表明:室溫下MEL的W線型是極化子對(polaron pair,PP)的超精細(xì)相互作用和外磁場引起的塞曼作用對載流子自旋共同調(diào)控的結(jié)果;低溫下MEL的M線型與三重態(tài)-三重態(tài)激子湮滅(triplet-triplet annihilation,TTA)過程相關(guān),可以用零場劈裂與塞曼作用對三重態(tài)激子對(triplet pair state,(TT)i)演化過程的共同調(diào)控來解釋.該發(fā)現(xiàn)不僅豐富了有機(jī)半導(dǎo)體中的磁現(xiàn)象,而且加深了對有機(jī)發(fā)光器件中激發(fā)態(tài)間自旋相互作用的認(rèn)識.
[Abstract]:The organic light-emitting diodes (OLEDs) based on 5HY611111-tetraphenylnaphthacene (Rubrene) were prepared, and the magneto-electroluminescent magneto-electroluminescence (Mel) curves were measured at different bias voltages and working temperatures. The experimental results show that the Mel curves are W line in the range of several nano#china_person0# near zero magnetic field at room temperature. However, when the temperature decreases to about 75 K, the W-shape vanishing Mel presents a new fine structure, that is, the ultra-small field effect of M-type. This evolution process has not been reported in previous literatures. The analysis shows that the W line of MEL at room temperature is the result of hyperfine interaction between polaron pairn and Zeeman interaction induced by external magnetic field on the carrier spin. The M-lineform of MEL at low temperature is related to the triplet-triplet annihilation of excitons (triplet-triplet). It can be explained by the co-regulation of zero-field splitting and Zeeman interaction on the evolution of triplet pair state in triplet excitons. This discovery not only enriches the magnetic phenomena in organic semiconductors. Furthermore, the spin interaction between excited states in organic luminescent devices is well understood.
【作者單位】： 西南大學(xué)物理科學(xué)與技術(shù)學(xué)院;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:11374242)資助項(xiàng)目
【分類號】：TN383.1

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