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

Jin-liang SHANG; Ying-ying WEI; Jun-li WANG; Xu-guang LIU; Yan-qin MIAO

doi:10.37188/CJL.20210115

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

Invited Paper | 更新时间：2021-09-03

- Synthesis of Triphenylmethyl Modified Oil-soluble Carbon Quantum Dots and Their Applications in Light-emitting Devices
  增强出版
- Chinese Journal of Luminescence Vol. 42, Issue 8, Pages: 1257-1266(2021)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(51972221);Scientific Research Foundation for Returned Overseas Scholars of Shanxi Province(HGKY2019027;2020-051);Shanxi Key Research and Development Program (International Cooperation)(201903D421087);Outstanding Young Academic Leader of Shanxi Higher Education Institutions
- DOI：10.37188/CJL.20210115
  CLC： O482.31
- Received：31 March 2021，
  
  Revised：16 April 2021，
  
  Published：01 August 2021
- 稿件说明：
移动端阅览
Jin-liang SHANG, Ying-ying WEI, Jun-li WANG, et al. Synthesis of Triphenylmethyl Modified Oil-soluble Carbon Quantum Dots and Their Applications in Light-emitting Devices[J]. Chinese journal of luminescence, 2021, 42(8): 1257-1266.
DOI：

Jin-liang SHANG, Ying-ying WEI, Jun-li WANG, et al. Synthesis of Triphenylmethyl Modified Oil-soluble Carbon Quantum Dots and Their Applications in Light-emitting Devices[J]. Chinese journal of luminescence, 2021, 42(8): 1257-1266. DOI： 10.37188/CJL.20210115.

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23 000 cd/m

。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

。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。

Abstract

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 23 000 cd/m

.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

. 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.

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