Crystalline Phase-tuned Multicolor Luminescence of Carbon Dots for White-light-emitting Diode Devices

ZHANG Xuewen; MIAO Runze; XU Fengli; ZHANG Yufei; SONG Kai; XU Wenjun; QIN Zhenxing

doi:10.37188/CJL.20220316

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Crystalline Phase-tuned Multicolor Luminescence of Carbon Dots for White-light-emitting Diode Devices

Synthesis and Properties of Materials | 更新时间：2023-03-13

- Crystalline Phase-tuned Multicolor Luminescence of Carbon Dots for White-light-emitting Diode Devices
- Chinese Journal of Luminescence Vol. 44, Issue 2, Pages: 298-306(2023)
- 作者机构：
  
  1.太原科技大学应用科学学院，山西太原　030024
  2.山西量界数字科技有限公司，山西太原　030021
- 作者简介：
- 基金信息：
  
  Fundamental Research Program of Shanxi Province(202103021224268);Key R & D Projects of Shanxi Province(201903D321111);Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(2021L298);National Natural Science Foundation of China(51502189)
- DOI：10.37188/CJL.20220316
  CLC： O482.31;TN312.8
- Published：05 February 2023，
  
  Received：31 August 2022，
  
  Revised：17 September 2022，
- 稿件说明：
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张学文,苗润泽,许凤利等.晶相对碳点多色发光的调制及其在白光发光二极管器件中的应用[J].发光学报,2023,44(02):298-306.

ZHANG Xuewen,MIAO Runze,XU Fengli,et al.Crystalline Phase-tuned Multicolor Luminescence of Carbon Dots for White-light-emitting Diode Devices[J].Chinese Journal of Luminescence,2023,44(02):298-306.
张学文,苗润泽,许凤利等.晶相对碳点多色发光的调制及其在白光发光二极管器件中的应用[J].发光学报,2023,44(02):298-306. DOI： 10.37188/CJL.20220316.

ZHANG Xuewen,MIAO Runze,XU Fengli,et al.Crystalline Phase-tuned Multicolor Luminescence of Carbon Dots for White-light-emitting Diode Devices[J].Chinese Journal of Luminescence,2023,44(02):298-306. DOI： 10.37188/CJL.20220316.

摘要

报道了一种以邻苯二甲酸前体结晶作为基质包覆碳点制备固态荧光材料的方法。通过改变溶剂，微波合成分别发射蓝色和绿色荧光的晶态碳点。详细的结构和光谱表征后发现，在形成碳点的同时，由邻苯二甲酸前体结晶在碳点的周围生长了晶态基质，该基质对碳点的分散作用有效阻断了碳点的聚集，从而阻止了碳点荧光猝灭的发生。并且，晶态基质结构的变化导致了碳点碳核和基质界面处吡啶氮类基团增多，从而致使该碳点发光颜色变化。鉴于其优异的发光性能，所制备晶态碳点用于封装白光发光二极管器件（WLED）。通过与商用荧光粉相结合，蓝色光碳点封装的WLED在色度坐标为（0.37，0.36）时获得了相关色温4 061 K、显色指数88.4的暖白光。而绿色光碳点封装的WLED在色度坐标为（0.36，0.34）时获得了相关色温44 678 K、显色指数85的暖白光。优异的光度学参数赋予这些荧光纳米材料在光电领域潜在的应用价值。

Abstract

A method to one-pot synthesize solid fluorescent materials by coating carbon dots

via

the crystallization of phthalic acid precursor as matrix is reported. The crystalline CDs， emitting blue and green fluorescence respectively， are synthesized by changing the solvent in microwave method. After detailed structural and spectral characterizations， it is found that a crystalline matrix is grown around the CDs by the phthalic acid precursor when the CDs is formed， and the dispersion effect of the matrix on the CDs effectively blocked the aggregation of the CDs， thus preventing the occurrence of fluorescence quenching of the CDs. Furthermore， the change of crystalline matrix structure in G-CDs leads to the increase of pyridine nitrogenous groups at the interface between core and matrix in the CDs， resulting in a change of fluorescent color of the CDs with different crystalline structures. The resultant crystalline CDs are also used to fabricate white-light emitting diode devices （WLED） in view of its excellent luminescence performance， which achieves a warm-white light with the correlated color temperature （CCT） of 4 061 K， color rendering index （CRI） of 88.4 at the chromaticity coordinates of （0.37， 0.36） using B-CDs combined with the commercial phosphors and another warm-white light with the CCT of 4 478 K， CRI of 85 at the chromaticity coordinates of （0.36， 0.34） using G-CDs combined with the commercial phosphors. The excellent photometric parameters give these fluorescent nanomaterials potential application value in optoelectronic field.

关键词

晶态碳点多色发光吡啶氮类基团发光二极管

Keywords

crystalline CDsmulticolor luminescencepyridine nitrogenous groupsLED

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