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新型席夫碱铂(Ⅱ)配合物的合成及其光电性质研究
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作者单位
肖文平,檀笑风,高杨,戴雷,霍延平 1. 广东工业大学 轻工化工学院广东 广州 510006 2. 广东阿格蕾雅光电材料有限公司广东 佛山 528300 
基金项目:广东省基础和应用基础研究专项基金(2019B1515120035);广东省重点领域研发项目计划(2020B010130005)
中文摘要:为改善席夫碱铂(Ⅱ)配合物因聚集猝灭引发的性能低下问题,在其外围引入大位阻苯基基团,合成了两种新型席夫碱铂(Ⅱ)配合物SPtA和SPtB,对其进行1H NMR、13C NMR、HRMS表征,并选取SPtB作为掺杂客体材料,采用真空蒸镀法制备了一系列器件进行光电性质研究。结果表明,SPtA和SPtB的热分解温度分别为395 ℃和420 ℃,最大发射波长均为632 nm,光致发光量子产率(PLQY)分别达到45%和47%。通过对发光层结构的优化,以4,4',4''-三(咔唑-9-基)三苯胺(TCTA)、3,3'-[5'-[3-(3-吡啶基)苯基][1,1'∶3',1''-三联苯]-3,3''-二基]二吡啶(TmPyPB)作为混合主体,发光层厚度为30 nm,SPtB的掺杂浓度为3%(质量分数)制备的器件获得了10.5 cd/A的最大电流效率,7.2 Im/W的最大功率效率和9.6%的最大外量子效率(EQE)。该器件的最大发射波长为630 nm,CIE坐标为(0.64,0.35),为高色纯度的红色磷光OLED器件。研究表明,在席夫碱铂(Ⅱ)配合物的外围引入大位阻苯基,可起到减少分子聚集的作用,提升分子性能。
中文关键词:席夫碱  铂(Ⅱ)配合物  光电性质  红色磷光
 
Syntheies of Novel Schiff Base Platinum(Ⅱ) Complexes and Their Optoelectronic Properties
Abstract:Schiff base platinum(Ⅱ) complexes are considered to be a promising red phosphorescent organic light-emitting diode(OLED) material in biomedical display,telecommunication security and other fields due to their stability,modifiability and easy synthesis.However,they often leads to some problems such as low photoluminescence quantum yield(PLQY) and low device performance caused by aggregation quenching due to their obvious structural planarity.Introducing groups with larger steric hindrance at the periphery of the Schiff base may effectively improve the above problems.In this study,the corresponding ligands were synthesized and further coordinated with K2PtCl4 under alkaline conditions to synthesize two novel Schiff base platinum(Ⅱ) complexes SPtA and SPtB with peripherally introduced large sterically hindered phenyl groups.The compounds were characterized by nuclear magnetic resonance(NMR) and high-resolution mass spectrometry(HRMS). Theoretical calculations for the compounds were performed using time-dependent density functional theory (TDDFT).The thermodynamic properties of the compounds were studied by thermogravimetric analysis(TGA) and differential scanning calorimetry(DSC).The electrochemical properties of the compounds were determined by cyclic voltammetry(CV).Meanwhile,the optical properties such as absorption and emission spectra,PLQY,and phosphorescence lifetime of the compounds were studied.Using SPtB as the doped guest material,a series of devices were fabricated by vacuum evaporation method to study the optoelectronic properties.The results showed that the thermal decomposition temperatures(Td) of SPtA and SPtB are 395 ℃ and 420 ℃,which are higher thermal decomposition temperatures,while the maximum emission wavelengths are both 632 nm,and PLQYs were 45% and 47%,which were higher than those of reference molecule. In the following device studies,the effects of the host,thickness,and guest doping ratio of the light-emitting layer on the device performance were compared.Finally,with tris(4-carbazoyl-9-ylphenyl)amine (TCTA) and 1,3,5-tri(m-pyrid-3-yl-phenyl)benzene (TmTyPB) as mixed hosts,the thickness of the light-emitting layer was 30 nm,the doping concentration of SPtB was 3%,and the optimal device structure was obtained.It had a maximum current efficiency of 10.5 cd/A,a maximum power efficiency of 7.2 Im/W and a maximum external quantum efficiency(EQE) of 9.6%.The maximum emission wavelength of the device was maintained at 630 nm under different voltages,and the CIE coordinates were (0.64,0.35),which was a red phosphorescent OLED device with high color purity.Studies showed that the introduction of large sterically hindered phenyl groups at the periphery of Schiff base platinum(Ⅱ) complexes could reduce molecular aggregation and improve molecular performance.
Key Words:Schiff base  platinum (Ⅱ) complex  photoelectric properties  red phosphorescence
引用本文:肖文平,檀笑风,高杨,戴雷,霍延平.新型席夫碱铂(Ⅱ)配合物的合成及其光电性质研究[J].分析测试学报,2022,41(7):978-987.
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