基于蒽/芘分子封端的芴-芳胺衍生物的可溶液加工的蓝光材料的合成与光电性质

合成了两类分别基于芘和蒽封端的芴-芳胺衍生物（FAn,FPy）的新型可溶液加工蓝色发光分子,两种材料均溶于常规的有机溶剂,并且可以旋涂成膜. 通过紫外-可见光谱和荧光光谱对其在溶液中和固态薄膜下的光学性能进行了表征,发现这两类分子在固态下发射峰分别位于449和465 nm,属于蓝色发光材料. 并通过循环伏安法表征了其电化学性能,计算得出FAn和FPy的最高占据分子轨道（HOMO）能级分别为-5.37 和-5.36eV. 结果表明N-己基二苯胺的引入有效阻止了分子在固态下的平面堆积,抑制了长波发射,并且提高了分子HOMO能级,改善了空穴注入能力. 差示扫描量热法（DSC）和热重分析（TGA）测试表明这两类化合物均显示出良好的热稳定性,其中FAn的玻璃化转变温度和热分解温度分别达到了207和439 ℃. 良好的性能使得这两类材料成为一种潜在的可溶液加工的蓝光材料.     

Solution-processed CuOx as an efficient hole-extraction layer for inverted planar heterojunction perovskite solar cells

A solution-processed CuO_x film has been successfully integrated as the hole-transporting layer (HTL) for inverted planar heterojunction perovskite solar cells (PVSCs). The CuO_x layer is fabricated by simply spin-coating a copper acetylacetonate (Cu(acac)₂) chloroform solution onto ITO glass with high transparency in the visible range. The compact and pinhole-free perovskite film with large grain domains is grown on the CuO_x film. The inverted PVSCs with the structure of ITO/CuO_x/MAPbI₃/PC₆₁BM/ZnO/Al are fabricated and show a best PCE of 17.43% under standard AM 1.5G simulated solar irradiation with a V_OC of 1.03 V, a J_SC of 22.42 mA cm^-2, and a fill factor of 0.76, which is significantly higher and more stable than that fabricated from the often used hole-transporting material PEDOT:PSS (11.98%) under the same experimental conditions. The enhanced performance is attributed to the efficient hole extraction through the CuO_x layer as well as the high-quality CH₃NH₃PbI₃ films grown on the CuO_x. Our results indicate that low-cost and solution-processed CuO_x film is a promising HTL for high performance PVSCs with better stability.     

Starburst-Type Carbazole Trimers as Host Materials for Solution-Processed Phosphorescent OLEDs

Novel starburst-type carbazole trimers SB-1 and SB-2 were developed as hole-transporting host materials for phosphorescent organic light-emitting diodes (PhOLEDs). The triplet levels (T₁s) of SB-1 and SB-2 were determined as at 2.81 and 2.73 eV, respectively. Also, these compounds afforded stable amorphous thin films upon spin-coating, and thus it was found that they are applicable to solution-processed devices. Indeed, blue PhOLEDs were fabricated by a solution method using SB-1 and SB-2 as host materials, where better device performance was obtained for the SB-1-based device due to its higher-lying T₁.     

基于蒽/芘分子封端的芴-芳胺衍生物的可溶液加工的蓝光材料的合成与光电性质

Two novel potential solution-processed blue fluorescent emitters composed of a core fluorenediphenylamine unit capped with either anthracene (FAn) or pyrene (FPy) were synthesized and characterized. They were both soluble in common organic solvents and solutions gave smooth films after spin coating. Their optical properties in solution and in the film were investigated by UV-visible and photoluminescence (PL) spectroscopy. The PL emission maximum of FAn and FPy in the film state were found to be 449 and 465 nm, respectively. The electrochemical properties of the as-prepared samples were studied by cyclic voltammetry. The estimated highest occupied molecular orbital (HOMO) energy levels were -5.37 and -5.36 eV for FAn and FPy, respectively. These results indicate that the introduction of diphenylamine effectively prevents plane stacking of the molecules in the solid state, which suppresses the formation of long-wavelength aggregates, and the high HOMO levels enhance the hole-injection ability of the compounds. The results of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) indicate that the two materials have excellent thermal stability with the glass transition temperature of FAn reaching 207 ℃ and the thermal decomposition temperature as high as 439 ℃. The good performance of the fluorescent emitters makes them promising candidates as solution-processed blue organic light-emitting diodes.