三苯甲基改性油溶性碳量子点合成及其在发光器件中的应用  

Synthesis of Triphenylmethyl Modified Oil-soluble Carbon Quantum Dots and Their Applications in Light-emitting Devices

作　　者：尚金梁 卫迎迎 王军丽 刘旭光[1,2] 苗艳勤[2] SHANG Jin-liang;WEI Ying-ying;WANG Jun-li;LIU Xu-guang;MIAO Yan-qin(Institute of New Carbon Materials, Taiyuan University of Technology, Taiyuan 030000, China;Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030000, China)

机构地区：[1]太原理工大学新型碳材料研究院,山西太原030000 [2]太原理工大学新材料界面科学与工程教育部重点实验室,山西太原030000

出　　处：《发光学报》2021年第8期1257-1266,共10页Chinese Journal of Luminescence

基　　金：国家自然科学基金(51972221);山西省回国留学人员科研资助项目(HGKY2019027,2020-051);山西重点研发计划(国际合作)(201903D421087);山西省高等学校优秀青年学术带头人资助项目。

摘　　要：碳量子点团聚将导致严重荧光猝灭,大幅降低其发光效率,阻碍了其作为发光材料在显示和照明器件中的应用。通过主客体掺杂方案可有效解决上述问题,但水溶性的碳量子点不能和有机的主体材料相匹配。针对该问题,本文通过在碳量子点表面接枝亲油性的芳香类官能团,保证碳量子点油溶性的同时使其具备一定的载流子传输性能,采用该方案制备出发光峰在533 nm、荧光量子产率为43%的黄色油溶性碳量子点。将该碳量子点分散到聚甲基丙烯酸甲酯中涂敷在紫外发光二极管(365 nm)灯珠表面,制备的光致发光器件发出明亮黄光(560 nm),最大亮度达到23000 cd/m^(2)。进一步将该碳量子点掺杂到聚乙烯基咔唑中作为发光层,制备了主客体掺杂的电致发光器件,器件的发射峰位于552 nm,最大亮度达到35.07 cd/m^(2)。上述研究表明,合成油溶性的碳量子点发光材料并将其掺杂到母体材料中作为发光层,可有效抑制碳量子点团聚诱导荧光猝灭问题,对发展高性能碳量子点基发光器件具有重要意义。The aggregation of carbon quantum dots leads to serious fluorescence quenching,which greatly reduces the luminescence efficiency and hinders the application of carbon quantum dots as luminescent materials in display and lighting devices.The host-guest doping scheme can effectively solve the above problems,but the water-soluble carbon quantum dots can not match the organic host materials.In view of this,in this paper,the oil solubility of the carbon quantum dots was guaranteed by grafting the aromatic functional groups with liophilic properties on the surface of the carbon quantum dots,so that the carbon quantum dots had certain carrier transport performance.The yellow oil-soluble carbon quantum dots with a light peak of 533 nm and a fluorescence quantum yield of 43%were prepared by this scheme.The carbon quantum dots were dispersed into polymethyl methacrylate(PMMA)and coated on the surface of UV light emitting diode(365 nm)lamp beads.The photoluminescent devices were prepared with a bright yellow light(560 nm)and a maximum luminance of 23000 cd/m^(2).Furthermore,the carbon quantum dots were doped into polyethylene carbazole(PVK)as the luminescent layer to fabricate host-guest doped electroluminescent devices.The emission peak of the devices is 552 nm,and the maximum luminance of the devices reaches 35.07 cd/m^(2).The above studies indicate that the synthesis of oil-soluble carbon quantum dot luminescent materials and doping them into the parent material as the luminescent layer can effectively suppress the fluorescence quenching induced by carbon quantum dot aggregation,which is of great significance for the development of high-performance carbon quantum dot based luminescent devices.

关 键 词：碳量子点 发光二极管 三苯甲基 主客体掺杂发光层 亮度 

分 类 号：O482.31[理学—固体物理]