【摘要】：有機電致發(fā)光二極管(OLED)以其節(jié)能、可視化角度大、發(fā)光效率高、響應(yīng)速度快、無炫光,可實現(xiàn)柔性化等優(yōu)點,被普遍認為是下一。代的照明及顯示技術(shù)。OLED從發(fā)展到現(xiàn)存已有20多年的歷史,生產(chǎn)成本較高,色穩(wěn)定性控制難,效率需要進一步等原因,致使OLED至今都沒能在我們的生活中大規(guī)模的普及。本論文根據(jù)以上提出的問題,從OLED的發(fā)光原理出發(fā),通過優(yōu)化器件的結(jié)構(gòu)等方式來改善雙波段發(fā)光器件的性能。本論文的研究內(nèi)容包括以下幾方面： 1.針對白色熒光器件啟亮電壓較高的問題,設(shè)計了由紅色熒光材料DCJTB和藍色熒光材料OXD-7組成的雙波段白光器件,通過采用在空穴注入層NPB與發(fā)光層OXD-7之問增加能級緩沖層和在OXD-7中摻雜雙極性材料CBP兩種方式來減小空穴的傳輸勢壘,從而降低器件的啟亮電壓。 2.針對白色磷光器件在高電流密度下容易發(fā)生效率滾降和色穩(wěn)定性差的問題,設(shè)計了mCP摻雜Firpic作為藍色發(fā)光層和CBP摻雜1r(MDQ)2acac作為紅色發(fā)光層的雙波段白光器件。通過在藍色發(fā)光層和紅色發(fā)光層之間增加中問層mCP的方法,阻止了三線態(tài)激子湮滅導(dǎo)致的效率滾降,提高了器件的發(fā)光效率；通過在紅色發(fā)光層與電子傳輸層TPBi之問增加單層mCP的方法控制激子的復(fù)合區(qū)域,提高了器件的色穩(wěn)定性。 3.針對熒磷混合器件,磷光層中的大量三重態(tài)激子能量回傳給熒光層造成許多三重態(tài)激子為不發(fā)光模式的問題,設(shè)計了以Firpic為藍色磷光發(fā)光材料和DCJTB為紅色熒光發(fā)光材料的雙波段白光器件。采用在發(fā)光層之問添加TCTA作為中間阻擋層和提高空穴注入層NPB與Firpic主體材料之間的能級勢壘兩種方式來調(diào)節(jié)三線態(tài)激子能量傳遞,從而提高了藍光的發(fā)光強度,改善了器件的發(fā)光顏色和亮度,使器件顏色更接近白光并且器件亮度明顯提升。
[Abstract]:Organic electroluminescent diode (OLED) is considered to be the next one because of its advantages such as energy saving, large visual angle, high luminous efficiency, fast response, no glare, flexibility and so on. OLED has been developed for more than 20 years, the production cost is high, the control of color stability is difficult, and the efficiency needs to be further. As a result, OLED has not been widely used in our daily life. In this paper, based on the principle of OLED, the performance of dual-band light-emitting devices is improved by optimizing the structure of the devices. The research content of this thesis includes the following aspects: 1. A dual-band white light device composed of red fluorescent material DCJTB and blue fluorescent material OXD-7 is designed to solve the problem of high starting voltage of white fluorescent devices. By increasing the energy level buffer layer between the hole injection layer (NPB) and the luminescent layer (OXD-7) and doping the bipolar material CBP in the OXD-7, the transmission barrier of the hole is reduced, thus the starting voltage of the device is reduced. 2. In order to solve the problem that white phosphorescence devices are prone to efficiency rollout and poor color stability at high current density, a dual-band white light device with mCP doped Firpic as blue luminescence layer and CBP doped 1r (MDQ) 2acac as red luminescent layer is designed. By adding the intermediate layer mCP between the blue layer and the red layer, the efficiency of the three-line exciton annihilation is prevented and the luminescence efficiency of the device is improved. The color stability of the device is improved by adding a single layer mCP between the red luminescence layer and the electron transport layer (TPBi) to control the recombination region of the exciton. 3. For fluorophos mixers, a large number of triplet excitons in the phosphor layer are transmitted back to the fluorescence layer, causing many triplet excitons to be in non-luminescent mode. A dual band white light device using Firpic as blue phosphorescence material and DCJTB as red fluorescent material is designed. By adding TCTA to the luminescent layer as the intermediate barrier layer and increasing the energy level barrier between the hole injection layer NPB and the main material of the Firpic, the energy transfer of the three-wire exciton is regulated, thus the luminescence intensity of the blue light is improved. The luminous color and luminance of the device are improved, the color of the device is closer to white light and the brightness of the device is improved obviously.
【學(xué)位授予單位】：北京交通大學(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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