發(fā)布時間：2018-01-14 01:13

  本文關(guān)鍵詞：激基復合物基高性能熒光有機發(fā)光二極管的研究　出處：《太原理工大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 有機發(fā)光二極管 激基復合物 熱活化延遲熒光 能量傳遞 顯色指數(shù)

【摘要】：有機發(fā)光二極管(Organic Light-Emitting Diode,OLED)已逐漸從實驗室研發(fā)階段開始向商業(yè)化應用階段轉(zhuǎn)化,但目前高效率的OLED幾乎都采用磷光材料制的,磷光材料價格昂貴,且高效率、高穩(wěn)定性藍色磷光材料的短缺限制了磷光OLED的發(fā)展。熱活化延遲熒光(Thermally Activated Delayed Fluorescence,TADF)材料因其具有無重金屬、價格低廉及理論上100%激子利用率等優(yōu)勢,成為時下的一個研究熱點。TADF發(fā)光體的一個分支——TADF激基復合物因其具有材料選擇廣泛、寬光譜等優(yōu)勢,近年來作為主體或發(fā)光體在OLED中得到廣泛研究,并得到快速發(fā)展。但TADF激基復合物OLED的工作機理尚不完善,TADF激基復合物在單色光及白光熒光OLED的器件性能也有待于進一步提高。針對上述問題,本論文的主要研究內(nèi)容如下:1.采用TCTA作為給體材料、3P-T2T作為受體材料,分別進行蒸鍍,實現(xiàn)了具有TADF特性的分層界面激基復合物(TCTA/3P-T2T);進一步,將橙光發(fā)射的Rubrene摻入3P-T2T層,并優(yōu)化Rubrene在3P-T2T中的摻雜濃度,實現(xiàn)了從激基復合物TCTA/3P-T2T到摻雜劑Rubrene的有效能量傳遞。通過簡單的器件結(jié)構(gòu)制備了基于Rubrene發(fā)射的高效率橙光熒光OLED。在優(yōu)化的摻雜濃度1.5%下,器件實現(xiàn)的最大電流效率、功率效率和外量子效率分別為25.3cd/a、22.6lm/w和8.1%。高效率的實現(xiàn)歸因于激基復合物tcta/3pt-2t的tadf特性,這使得激基復合物的三線態(tài)激子發(fā)生有效的反向系間竄越,進而實現(xiàn)了從激基復合物到摻雜劑的高效能量傳遞。與此同時,優(yōu)化的1.5%摻雜濃度也有效抑制了發(fā)生在激基復合物和摻雜劑三線激發(fā)態(tài)之間的dexter能量傳遞過程。2.采用mcp作為給體材料、po-t2t作為受體材料,將給受體材料按1:1的比例共蒸,制備了具有tadf特性的藍光發(fā)射激基復合物(mcp:3p-t2t);進一步,將橙光發(fā)射的熒光材料rubrene摻雜到該tadf激基復合物主體中,優(yōu)化rubrene的摻雜濃度,實現(xiàn)藍光激基復合物主體向rubrene的不完全能量傳遞,獲得高效率、高色穩(wěn)定性的熒光白光oled。在優(yōu)化的摻雜濃度1.6%下,白光oled實現(xiàn)了最大的電流效率、功率效率和外量子效率,分別為14.2cd/a,12.8lm/w和4.9%。同時,器件實現(xiàn)了高的色穩(wěn)定性,在4v,6v和8v的電壓下,其cie坐標分別為(0.384,0.439),(0.384,0.440)和(0.383,0.441)。高效率的實現(xiàn)歸因于激基復合物主體三線態(tài)激子的反向系間竄越和到摻雜劑的有效能量傳遞;而白光發(fā)射光譜高的色穩(wěn)定性則歸因于載流子從傳輸層到發(fā)光層的無勢壘注入、載流子在發(fā)光層平衡地傳輸和復合以及寬的載流子復合區(qū)域。3.為了進一步簡化白光oled的器件結(jié)構(gòu),提高白光oled的顯色指數(shù)(colorrenderingindex,cri),采用發(fā)光光譜較寬的m-mtdata:tpbi及m-mtdata/bepp2激基復合物的黃綠光發(fā)射,同時結(jié)合電子傳輸材料Bepp2自身的藍光發(fā)射,在兩種激基復合物基OLED的電子傳輸層一側(cè)引入TCTA激子阻擋層,通過對TCTA厚度細致的優(yōu)化,實現(xiàn)了激基復合物和Bepp2的同時發(fā)光,獲得了基于激基復合物發(fā)射的超簡單、高顯色指數(shù)的白光OLED。其中,基于m-MTDATA:TPBi共摻雜復合物熒光白光OLED的CRI值達到90,最大電流效率和功率效率分別達到9.3 cd/A和8.9 lm/W;基于m-MTDATA/Bepp2界面激基復合物熒光白光OLED的CRI值達到88,整個器件只用了三種有機材料,器件結(jié)構(gòu)更加簡單。這對開發(fā)結(jié)構(gòu)簡單、高CRI白光OLED具有很好的指導意義。
[Abstract]:Organic light emitting diode (Organic Light-Emitting Diode, OLED) has gradually from the stage of laboratory research and development began to transform to the commercial application stage, but the high efficiency OLED almost all of the phosphorescent materials, phosphorescent material is expensive, high efficiency and high stability, the shortage of blue phosphorescent materials limits the development of phosphorescent OLED. The activation of delayed fluorescence (Thermally Activated Delayed Fluorescence, TADF) materials because of its low price and no heavy metals, 100% theoretical exciton utilization and other advantages, become a TADF Electroplex branch of a research hotspot nowadays.TADF illuminant because of its wide selection of materials, wide spectrum and other advantages, in recent years as the main or light has been widely studied in OLED, and obtained rapid development. But the working mechanism of TADF Electroplex OLED is not perfect, the TADF exciplex complex in monochromatic light The performance of the device and white fluorescent OLED can be further improved. Aiming at the above problems, the main research contents of this thesis are as follows: 1. using TCTA as donor material, 3P-T2T as the receptor material, respectively, evaporation, realized the hierarchical interface of Electroplex with the characteristics of TADF (TCTA/3P-T2T); further, the orange light the launch of Rubrene doped 3P-T2T layer, and optimize the concentration of Rubrene in 3P-T2T, realize the transfer from exciplex TCTA/3P-T2T to energy efficient dopant Rubrene. Through the simple device structure was prepared based on high efficiency fluorescent OLED. Rubrene orange light emission in 1.5% under the optimum doping concentration, the maximum current efficiency device, power efficiency and external quantum efficiency were 25.3cd/a, TADF characteristics are attributed to the exciplex tcta/3pt-2t 22.6lm/w and 8.1%. with high efficiency, which makes the exciplex complex three Excitons reverse effective intersystem crossing, and then realize the transfer from exciplex to high energy dopant. At the same time, 1.5% optimized doping concentrations also can effectively inhibit the occurrence between the exciplex and dopant three line excited Dexter energy transfer process using MCP as to.2. body material, po-t2t as the receptor material, will give the recipient material according to the proportion of 1:1 co evaporation, with the characteristics of TADF emission of Electroplex prepared (mcp:3p-t2t); further, doped fluorescent material rubrene orange light emission to the TADF exciplex complex subject, optimizing the doping concentration of rubrene the blue Electroplex subject to incomplete energy transfer, rubrene efficiency, high color stability of fluorescent white oled. in 1.6% under the optimum doping concentration, white OLED achieved the maximum current efficiency, power efficiency and quantity The sub efficiency, respectively 14.2cd/a, 12.8lm/w and 4.9%. at the same time, the device realizes high color stability, 4V, voltage 6V and 8V, the CIE coordinates are (0.384,0.439), (0.384,0.440) and (0.383,0.441). High efficiency implementation of inverse system is attributed to the exciplex body three triplet excitons. Intersystem crossing and effective energy transfer and dopant; white light emission spectra of high color stability is attributed to barrier free into the carrier from the transport layer to the light emitting layer, a light-emitting layer carrier in a balanced transmission and composite and wide carrier composite.3. device in order to further simplify the structure of white OLED, the color index white OLED (colorrenderingindex, CRI), the emission spectrum of a wide m-mtdata:tpbi and m-mtdata/bepp2 exciplex emission combined with yellow green light emission, electron transport material, Bepp2's blue, in two kinds of exciplex The introduction of OLED compounds based on one side of the electron transport layer TCTA exciton blocking layer, by optimizing the detailed TCTA thickness, while the exciplex and Bepp2 emission was realized, obtained based on exciplex emission of super simple, high color index of white light OLED. which Co doped m-MTDATA:TPBi composite fluorescent white OLED based on the CRI value reached 90, the maximum current efficiency and power efficiency are respectively 9.3 cd/A and 8.9 lm/W; m-MTDATA/Bepp2 interface exciplex fluorescence white OLED based on the CRI value reached 88, the device is only three kinds of organic materials, the device structure is more simple. This paper has the advantages of simple structure, which is of great significance in high CRI white OLED.

【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN383.1

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本文編號：1421364