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含三苯胺树枝分子发光材料合成与电致发光性能研究/OLED器件的制作
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摘要
本文以二苯并噻吩-三苯胺(ST-G1),萘-三苯胺树枝形分子(NP-G1)为发光层,制备了结构为ITO/TCTA/ ST-G1&NP-G1/BCP/Mg:Ag的三层发光器件,测试了器件的电致发光性能。该器件在6V开启,12V电压下亮度和效率接近1000 cd m~(-2)和0.2 lm W~(-1)。
     测试所合成的材料的紫外可见光谱、单光子荧光谱性质,通过运用Lippert方程、偶极矩的变化、电化学循环伏安法等从理论上详细讨论了多枝分子结构、分子的平面性、分子“核”对其单光子吸收与荧光行为影响。得出如下研究结果:
     (1)发现分子“核”不同导致分子内电荷转移的不同,从而影响了分子荧光性质,共轭度越大,分子的荧光越强。荧光强度的大小:二苯并噻吩核>萘核。
     (2)在有机电致发光器件中较厚的发光层,低的LUMO和高的HOMO提高了发光强度与电流效率,电流密度随电压的变化曲线反映了器件的电学性质。
     (3)在有机电致发光器件中ITO须要用臭氧对其表面处理提高表面功函数;有机材料的蒸气压比较高,导热性比较差,在较高温度下容易分解;有机电致发光器件对氧和水非常敏感,两者都会降低器件的发光效率,影响器件的工作寿命。
The paper dibenzothiophene - triphenylamine (ST-G1), naphthalene - triphenylamine Dendritic molecules (NP-G1) as the emission layer with the structure of ITO / TCTA / ST-G1 & NP-G1/BCP / Mg: Ag in the three light-emitting devices, test EL device performance. The device in the open 6V, 12V voltage, brightness and efficiency of close to 1000 cd m-2 and 0.2 lm/W.
     System test the synthesized materials spectroscopy, single photon fluorescence spectral properties, through the use of Lippert equation, the dipole moment changes, cyclic voltammetry theory discussed in detail a number of branches of molecular structure, molecular plane of , molecular "core" of their single-photon absorption and fluorescence behaviors. The results obtained are as follows:
     (1) Tound that elements of "nuclear" different result in the different intramolecular charge transfer, thereby affecting the nature of the molecular fluorescence, the greater the degree of conjugation, the stronger the fluorescent molecules. The size of fluorescence intensity: dibenzothiophene core> naphthalene nucleus.
     (2) Electroluminescence device emitting layer of thick, low HOMO LUMO and high luminous intensity and improve the current efficiency, current density-voltage curves reflect the electrical properties of the device.
     (3) Electroluminescent devices ITO surface treatment have increased their use of ozone surface work function; organic material vapor pressure is relatively high, relatively poor thermal conductivity, easy to decompose at high temperatures; Light-Emitting Devices on very sensitive to oxygen and water, both of which reduce the luminescence efficiency, affecting the working life of the device.
引文
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