發(fā)布時間：2018-01-26 04:08

  本文關(guān)鍵詞： 有機(jī)發(fā)光二極管 電致發(fā)光磁效應(yīng) 超精細(xì)相互作用 單重態(tài)激子分裂 三重態(tài)-三重態(tài)激子淬滅　出處：《西南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,在不含任何磁性材料的有機(jī)光電器件(OLEDs)中出現(xiàn)的奇特的磁效應(yīng)也引起了人們的廣泛關(guān)注。研究人員對有機(jī)磁場效應(yīng)的機(jī)理進(jìn)行了深入的研究并提出了許多理論模型。但隨著研究的深入,人們發(fā)現(xiàn)OLEDs的磁效應(yīng)復(fù)雜多變,至今還沒有一種微觀機(jī)制能解釋所有的實驗現(xiàn)象。每一種機(jī)制只能部分解釋器件的磁效應(yīng)或某些特定材料組成的有機(jī)發(fā)光器件的磁效應(yīng),而對于一些奇特磁效應(yīng)卻不能很好的解釋。因此,探究這些復(fù)雜磁效應(yīng)的微觀機(jī)制也就成為了研究人員關(guān)注的焦點之一本論文先針對摻雜型有機(jī)發(fā)光二極管的奇特電致發(fā)光磁效應(yīng)及其影響因素進(jìn)行了深入分析。通過改變摻雜濃度、注入電流密度和溫度,研究器件磁發(fā)光效應(yīng)的變化探究導(dǎo)致其復(fù)雜磁效應(yīng)的微觀機(jī)制。然后,在具有單重態(tài)激子裂變(STT)和三重態(tài)-三重態(tài)激子淬滅(TTA)性質(zhì)的摻雜型有機(jī)發(fā)光二極管中,定性的研究了摻雜濃度對摻雜器件磁場效應(yīng)的影響,試圖探究STT和TTA兩種微觀機(jī)制間的競爭及其微觀差異。本論文主要可分為以下幾個部分：(1)首先,介紹了有機(jī)磁場效應(yīng)的發(fā)展歷程及其發(fā)展現(xiàn)狀：之后詳細(xì)介紹了有機(jī)發(fā)光二極管磁效應(yīng)的研究進(jìn)展以及提出的一些物理機(jī)制模型,如超精細(xì)相互作用模型、三重態(tài)-三重態(tài)激子淬滅模型、單重態(tài)激子裂變模型等。在本文的第二章主要介紹了有機(jī)發(fā)光二極管的制備技術(shù)和有機(jī)磁效應(yīng)測試方法,以及在制備和測試器件過程中需要注意的一些問題。(2)在具有較高三重態(tài)激子能量的磷光材料mCP中摻入單重態(tài)與三重態(tài)激子能量共振的熒光染料Rubrene,制備了結(jié)構(gòu)為ITO/CuPc/NPB/mCP:Rubrene/BCP/LiF/A1的摻雜型有機(jī)發(fā)光二極管,并測量了不同摻雜濃度下器件的磁場效應(yīng)。并測量了不同摻雜濃度下器件的MEL。實驗發(fā)現(xiàn)：摻雜器件的電致發(fā)光磁場效應(yīng)(MEL)表現(xiàn)出了奇特線型,且MEL的低場(B≤5 mT)和高場(5mT≤B≤500 mT)部分隨著摻雜濃度的改變都發(fā)生了明顯的變化。室溫下,隨摻雜濃度的改變,MEL低場部分均表現(xiàn)為快速小幅增加。而MEL高場部分的線型和幅度都與摻雜濃度有關(guān)：摻雜濃度較大時,MEL隨磁場增大先小幅度降低然后大幅增加；摻雜濃度適中時,MEL表現(xiàn)為先增加后降低；摻雜濃度較小時,MEL隨磁場單調(diào)降低。這種奇特的磁場效應(yīng)可歸結(jié)為摻雜體系內(nèi)超精細(xì)相互作用、單重態(tài)激子裂變和三重態(tài)-三重態(tài)激子淬滅三種微觀過程共同作用的結(jié)果,而不直接產(chǎn)生熒光的三重態(tài)激子,可以通過一些自旋混合過程,改變單重態(tài)激子的比例,從而對器件發(fā)光產(chǎn)生重要影響。器件的工作溫度和注入電流密度對磁場效應(yīng)的影響進(jìn)一步證實了我們的觀點。(3)采用共蒸發(fā)技術(shù),制備了結(jié)構(gòu)為ITO/CuPc/NPB/A1q3:Rubrene/BCP/LiF/A1的摻雜型有機(jī)發(fā)光二極管。測量了不同Rubrene摻雜濃度下?lián)诫s器件的磁場效應(yīng)。實驗發(fā)現(xiàn),器件的MEL表現(xiàn)出復(fù)雜變化；在室溫下,隨著Rubrene摻雜濃度的減小,MEL的線型和幅度都發(fā)生了劇烈改變。通過對器件的結(jié)構(gòu)以及材料性質(zhì)的分析,我們認(rèn)為在摻雜器件中三重態(tài)-三重態(tài)激子淬滅(TTA)過程、單重態(tài)激子裂變(STT)過程共同存在。因此,本文認(rèn)為摻雜器件表現(xiàn)出的復(fù)雜線型是由于STT和TTA機(jī)制共存并相互競爭導(dǎo)致的；隨著Rubrene摻雜濃度的減小使得Rubrene分子間的距離增大,STT作用強度減弱,而TTA作用則不受其影響,從磁效應(yīng)的方面研究了TTA和STT微觀機(jī)制間的競爭及其微觀差異。器件的工作溫度和注入電流密度對磁場效應(yīng)的影響進(jìn)一步說明在摻雜器件中確實是TTA 和 STT機(jī)制共存的,證實了我們上述觀點。
[Abstract]:In recent years, in organic optoelectronic devices without any magnetic material (OLEDs) appeared in the peculiar magnetic effect has also aroused people's attention. The mechanism of organic magnetic field effect are researched and put forward many theoretical models. But with the in-depth research, people found that the magnetic effect of OLEDs the complex, yet a micro mechanism can explain all the experimental phenomena. Each mechanism can only partially explain the composition of magnetic effect devices or some specific materials for organic light emitting devices magnetic effect, and for some strange magnetic effect is not very good explanation. Therefore, exploring the microscopic mechanism of complex magnetic effect it has become one of the focus of researchers in this thesis for the first doping type peculiar electric organic light emitting diode emitting magnetic effect and its influencing factors were analyzed by modified. Variable doping concentration, injection current density and temperature change of the magnetic device luminous effect lead to explore microscopic mechanism of the complex magnetic effect. Then, in a singlet exciton fission (STT) and three - three triplet triplet exciton quenching (TTA) properties of doped organic light emitting diode two. Qualitative research on the influence of doping concentration on the doped device magnetic field effect, trying to explore STT and TTA two kinds of micro mechanism between competition and micro difference. This dissertation is mainly divided into the following sections: (1) firstly, introduced the development process of the organic magnetic field effect and its development status: after introduces the research progress of organic the light emitting diode magnetic effect and some physical mechanism of the proposed model, such as the hyperfine interaction model, three - three triplet singlet exciton quenching model, the singlet exciton fission model. In the second chapter of this article mainly introduces the Test method of organic preparation technology and organic magnetic effect of light emitting diode, and some problems in the preparation and the need to pay attention to in the process of testing the device. (2) with fluorescent dye Rubrene singlet and triplet exciton resonance three doped phosphorescent material mCP with high triplet exciton energy in the structure doped organic light emitting diode ITO/CuPc/NPB/mCP:Rubrene/BCP/LiF/A1 was prepared, the magnetic effect of different doping concentration device was measured. MEL. experiments at different concentration device and the measurement of doped El magnetic field effect (MEL) showed a peculiar type, and the low field MEL (B = 5, mT) and the high field (5mT = B = 500, mT) with the doping concentration change have changed obviously. At room temperature, with the doping concentration change, MEL low field showed a rapid increase slightly. While the MEL part of the high field Linear and amplitude are related to the doping concentration: the higher concentration of MEL decreased first, then increased sharply with the increase of magnetic field; doping concentration is moderate, MEL was increased first and then decreased; the doping concentration is MEL hours, with the magnetic field decreases monotonically. This magnetic effect should be attributed to the unique doping system of super fine interaction of singlet exciton fission and three singlet triplet exciton quenching - three interaction of three kinds of micro process results, three singlet exciton without direct fluorescence, through some spin mixing process, change the singlet exciton ratio, which has an important effect on the luminescence device. The working temperature and the injection effect of current density on the magnetic field effect further confirms our view. (3) by CO evaporation technique, were fabricated with the structure of ITO/CuPc/NPB/A1q3:Rubrene/BCP/LiF/A1 doped organic light emitting Magnetic field effect devices. The diode doped with different Rubrene concentration were measured. The experimental results showed that, the MEL device showed complex changes; at room temperature, with the decrease of Rubrene concentration, and the linear range of MEL have undergone dramatic changes. The structure of the device and analysis of material properties, we believe that in doped devices in three - three triplet triplet exciton quenching (TTA) process, the singlet exciton fission (STT) process are common. Therefore, the linear complexity of doped device performance is due to the STT and TTA coexistence and mutual competition mechanism caused; with decreasing concentration of Rubrene Rubrene makes the distance between molecules increase, weakening the strength of STT, while the TTA effect is not affected, from the magnetic effect of TTA was studied and the mechanism of STT competition and micro devices. Differences of temperature and injection current density The effect of the magnetic field on the effect of the magnetic field is further explained by the coexistence of TTA and STT mechanisms in the doped devices, which confirms our view.

【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN383.1

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