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近年来,人们在有机电致发光材料和器件结构方面取得了巨大的进步。然而由于蓝光材料具带隙宽的内禀属性,在发光效率、色纯度和稳定性上仍然面临巨大挑战。本文将螺旋形三萘苯共轭体系引入电致发光材料领域,它独特的螺旋形分子结构和易于化学修饰的特点有利于抑制聚集体和基激缔合物的形成。通过Si Cl4催化的环三缩合反应和Suzuki偶联反应,我们设计合成了以三萘基苯为核心,萘、蒽和三苯胺为取代基团的系列螺旋形蓝光寡聚物,并系统地研究了它们的热学、光物理和电化学性质。研究发现,萘和三苯胺取代的寡聚物1,3,5-三(3-(1-甲氧基萘-2-基)-4-甲氧基萘-1-基)苯(TNNB)和1,3,5-三(3-(4-(N,N-二苯胺基)苯基)-4-甲氧基萘-1-基)苯(TPANB)具有最好的热稳定性。在溶液中,这两种材料都具有深蓝发射,发射峰分别为382和415 nm;在薄膜中,TNNB的发射峰仅有1 nm的红移,而TPANB甚至产生了6 nm的蓝移。以这些寡聚物为发光材料,通过旋涂法制备的有机电致发光器件结果表明,基于TNNB的器件获得了最大亮度达到5273 cd?m(-2)~,色坐标(0.17,0.11)的纯蓝光器件。
In recent years, great progress has been made in the structure of organic electroluminescent materials and devices. However, due to the intrinsic properties of blue light with a wide bandgap, there are still huge challenges in terms of luminous efficiency, color purity and stability. In this paper, the introduction of helical tri-naphthalene conjugated system into the field of electroluminescent materials, its unique spiral molecular structure and easy chemical modification is conducive to inhibiting the formation of aggregate and base excimer. Through the SiCl4-catalyzed cycloaddition reaction and the Suzuki coupling reaction, we designed and synthesized a series of helix blue oligomers with naphthalene, anthracene and triphenylamine as the substitution groups centered on trinaphthylbenzene, and systematically studied Their thermal, photophysical and electrochemical properties. It was found that naphthalene and triphenylamine-substituted oligomers 1,3,5-tris (3- (1-methoxynaphthalen-2-yl) -4- methoxynaphthalen- 1-yl) benzene (TNNB) And 1,3,5-tris (3- (4- (N, N-diphenylamino) phenyl) -4-methoxynaphthalen-1-yl) benzene (TPANB) have the best thermal stability. In solution, both materials have dark blue emission with emission peaks of 382 and 415 nm, respectively; in the thin film, the emission peak of TNNB is only 1 nm redshift, whereas TPANB even produces a blue shift of 6 nm. Using these oligomers as luminescent materials, the results of the organic electroluminescent devices prepared by the spin-coating method show that the TNNB-based devices achieve the maximum luminance of 5273 cd? M (-2) ~, the color coordinates Pure blue device.