本文選題：聚集誘導(dǎo)發(fā)光 + 液晶發(fā)光材料�。� 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：近年來(lái)液晶發(fā)光材料因兼具液晶的有序性、流動(dòng)性,以及發(fā)光材料優(yōu)良的光物理性能,引起了科研工作者的關(guān)注,并發(fā)展為有機(jī)電致發(fā)光二極管(OLEDs)領(lǐng)域新的研究熱點(diǎn)。針對(duì)目前液晶發(fā)光材料種類(lèi)少、在固體中易發(fā)光淬滅、發(fā)光效率不高等科學(xué)問(wèn)題,本論文擬在液晶分子中引入聚集誘導(dǎo)發(fā)光概念,減少材料的濃度淬滅,提高液晶材料在固體薄膜中的發(fā)光效率�；谶@個(gè)研究思想,本論文研究工作聚焦于聚集誘導(dǎo)液晶發(fā)光材料(AIE-LCs),設(shè)計(jì)合成了系列基于四苯基乙烯單元的液晶發(fā)光材料;利用核磁共振氫譜、碳譜和時(shí)間飛行質(zhì)譜對(duì)其結(jié)構(gòu)進(jìn)行了表征;通過(guò)紫外-可見(jiàn)分光光度計(jì)、穩(wěn)態(tài)瞬態(tài)熒光光譜、循環(huán)伏安法、熱力學(xué)分析和小角X射線(xiàn)衍射研究了這類(lèi)液晶發(fā)光材料的光物理性能、液晶性能和電化學(xué)性能;以其中的兩個(gè)AIE-LCs藍(lán)光材料(TPE-PBN和TPE-2PBN)為發(fā)光層摻雜劑,以1,3-二咔唑-9-基苯(mCP)為主體材料,制備了OLEDs器件,研究了分子結(jié)構(gòu)與電致發(fā)光性能的關(guān)系。本論文主要的研究?jī)?nèi)容如下:1、設(shè)計(jì)合成了3種以四苯乙烯-苯基吡啶剛性結(jié)構(gòu)為發(fā)光內(nèi)核,以4-氰基聯(lián)苯為液晶單元的AIE液晶分子TPE-PBN、TPE-2PBN和TPE-4PBN。利用熱力學(xué)分析、偏光顯微鏡和小角X射線(xiàn)衍射研究了分子的液晶性能。通過(guò)紫外光譜和熒光光譜分別測(cè)試了它們?cè)赥HF/H2O混合溶液中的光物理性能。研究結(jié)果表明:TPE-PBN、TPE-2PBN和TPE-4PBN在THF/H2O混合溶液和固體薄膜中都呈現(xiàn)強(qiáng)烈的聚集誘導(dǎo)發(fā)光現(xiàn)象,其中TPE-PBN和TPE-2PBN在固體薄膜中的發(fā)光效率高達(dá)71%和81%;它們都具有液晶性能,并且隨著液晶基元數(shù)目的增加,其液晶性能發(fā)生變化。以TPE-PBN和TPE-2PBN為發(fā)光層摻雜劑,制備了有機(jī)電致發(fā)光器件,獲得了最大亮度為1612 cd/m2,最大發(fā)光效率為6.2 cd/A和最大外量子效率(EQE)為4.1%的藍(lán)綠光器件。2、在環(huán)金屬鉑配合物液晶發(fā)光材料中引入AIE發(fā)光基團(tuán)四苯基乙烯,合成了2類(lèi)6種以四苯乙烯和苯基吡啶衍生物作為主配體,以乙酰丙酮以及乙酰丙酮衍生物作為輔助配體的環(huán)金屬鉑配合物液晶發(fā)光材料Pt1~Pt6。詳細(xì)的探討了這些環(huán)金屬鉑配合物的液晶性能和光物理性能。研究表明:Pt1~Pt6在溶液和固體薄膜中都呈現(xiàn)出強(qiáng)烈的發(fā)光,并且環(huán)金屬配體中的烷基鏈長(zhǎng)度對(duì)配合物的紫外和發(fā)光性能影響較小;Pt1~Pt6都具有熱致型液晶性能,分子的結(jié)構(gòu)變化(主配體中烷基鏈的長(zhǎng)度和輔助配體的結(jié)構(gòu))對(duì)配合物的熱力學(xué)性能影響較大。其中,只有配合物Pt1具有聚集誘導(dǎo)發(fā)光增強(qiáng)效應(yīng)。本論文構(gòu)筑了系列基于四苯乙烯-苯基吡啶衍生物的液晶發(fā)光材料,詳細(xì)研究了它們的分子結(jié)構(gòu)-性能關(guān)系,初步揭示了聚集誘導(dǎo)液晶發(fā)光材料的分子構(gòu)筑規(guī)律,為構(gòu)筑高效發(fā)光的液晶材料提供了新的設(shè)計(jì)思路。
[Abstract]:In recent years, liquid crystal luminescent materials have attracted the attention of researchers because of their order, fluidity and excellent photophysical properties, and have become a new research hotspot in the field of organic electroluminescent diodes (OLEDs). Aiming at the scientific problems such as few kinds of liquid crystal luminescent materials, easy quenching of luminescence in solids and low luminescence efficiency, this paper intends to introduce the concept of agglomeration induced luminescence into liquid crystal molecules to reduce the concentration quenching of the materials. The luminescence efficiency of liquid crystal material in solid film was improved. Based on this idea, a series of liquid crystal luminescent materials based on tetraphenylethylene unit have been designed and synthesized by focusing on the agglomeration induced liquid crystal luminescence material (AIE-LCsN). The structure was characterized by carbon spectrum and time-of-flight mass spectrometry, and was characterized by UV-Vis spectrophotometer, steady-state transient fluorescence spectroscopy, cyclic voltammetry, The photophysical properties, liquid crystal properties and electrochemical properties of liquid crystal luminescent materials were studied by thermodynamics analysis and small angle X-ray diffraction. Two AIE-LCs blue light materials, TPE-PBN and TPE-2PBN, were used as luminescent layer dopants. The OLEDs devices were prepared by using 1 / 3- dicarbazole-9- (benzyl) mCPs as main materials. The relationship between molecular structure and electroluminescent properties was studied. The main contents of this thesis are as follows: 1. Three AIE liquid crystal molecules TPE-PBN TPE-2PBN and TPE-4PBN were designed and synthesized with tetrastyrene-phenylpyridine rigid structure as the luminescent core and 4-cyano-biphenyl as the liquid crystal unit. The liquid crystal properties of the molecules were studied by thermodynamics analysis, polarizing microscope and small angle X-ray diffraction. Their photophysical properties in THF/H2O mixed solution were measured by UV and fluorescence spectra respectively. The results show that both THF/H2O and TPE-2PBN and TPE-4PBN exhibit strong aggregation induced luminescence in THF/H2O mixed solution and solid film. The luminescence efficiency of TPE-PBN and TPE-2PBN in solid film is as high as 71% and 81% respectively. And with the increase of the number of liquid crystal units, the liquid crystal properties change. Organic electroluminescent devices (OLEDs) were prepared by using TPE-PBN and TPE-2PBN as dopants. A blue-green device with a maximum luminance of 1612 CD / m ~ (2), a maximum luminescence efficiency of 6.2 cd/A and a maximum external quantum efficiency of 4.1% was obtained. The AIE luminescent group tetraphenyl ethylene was introduced into the liquid crystal luminescent material of the cyclometallic platinum complex. Two kinds of six kinds of liquid crystal luminescent materials of platinum complexes with tetrastyrene and phenyl pyridine as main ligands and acetylacetone derivatives as auxiliary ligands were synthesized. The liquid crystal and photophysical properties of these cyclic platinum complexes are discussed in detail. The results show that the ratio Pt1 / Pt6 exhibits strong luminescence in both solution and solid films, and the alkyl chain length in the cyclic metal ligands has little effect on the UV and luminescence properties of the complexes. The changes of molecular structure (the length of alkyl chain in the main ligand and the structure of auxiliary ligand) have great influence on the thermodynamic properties of the complexes. Among them, only the complex Pt1 has agglomeration induced luminescence enhancement effect. In this paper, a series of liquid crystal luminescent materials based on tetrastyrene-phenylpyridine derivatives have been constructed, their molecular structure-performance relationship has been studied in detail, and the molecular architecture of agglomeration induced liquid crystal luminescent materials has been preliminarily revealed. It provides a new design idea for the construction of high efficiency luminescent liquid crystal materials.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：O753.2;O644.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 孫一峰,宋化燦,李衛(wèi)明,許遵樂(lè);有機(jī)電致發(fā)光材料VA二唑衍生物的合成[J];有機(jī)化學(xué);2003年11期

2 曹玉寶;;聚合物和液晶[J];有機(jī)化學(xué);1981年02期

相關(guān)碩士學(xué)位論文 前2條

1 石軍偉;基于苯并菲衍生物的鉑配合物液晶發(fā)光材料的設(shè)計(jì)合成及其性能研究[D];湘潭大學(xué);2015年

2 施建華;新型VA二唑、噻二唑衍生物的合成及液晶性研究[D];吉林大學(xué);2007年

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本文編號(hào)：1972879