Preparation and Properties of Carbon Dots-cellulose Composite Red Emitting Phosphors

Dong-na LI; Hong-xiang HE; Hao-ran ZHANG; Xian YANG; Yun-yan KANG; Ri-yue DONG; Wei LI; Xiao-qin PAN; Er-feng KOU; Ying-liang LIU; Bing-fu LEI

doi:10.37188/CJL.20210055

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Preparation and Properties of Carbon Dots-cellulose Composite Red Emitting Phosphors

Synthesis and Properties of Materials | 更新时间：2021-05-20

- Preparation and Properties of Carbon Dots-cellulose Composite Red Emitting Phosphors
- Chinese Journal of Luminescence Vol. 42, Issue 5, Pages: 635-641(2021)
- 作者机构：
  
  1.华南农业大学材料与能源学院　生物基材料与能源教育部重点实验室/广东省光学农业工程技术研究中心，广东　广州　 510642
  2.黄埔海关技术中心，广东　东莞　 523073
  3.岭南现代农业科学与技术广东省实验室　茂名分中心，广东　茂名　 525000
  4.华南农业大学　园艺学院，广东　广州　 510642
- 作者简介：
- 基金信息：
  
  Supported by National Natural Science Foundation of China(21671070)
- DOI：10.37188/CJL.20210055
  CLC：
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Dong-na LI, Hong-xiang HE, Hao-ran ZHANG, et al. Preparation and Properties of Carbon Dots-cellulose Composite Red Emitting Phosphors. [J]. Chinese Journal of Luminescence 42(5):635-641(2021)
DOI：

Dong-na LI, Hong-xiang HE, Hao-ran ZHANG, et al. Preparation and Properties of Carbon Dots-cellulose Composite Red Emitting Phosphors. [J]. Chinese Journal of Luminescence 42(5):635-641(2021) DOI： 10.37188/CJL.20210055.

摘要

白光LED器件作为新一代绿色固态照明光源，已广泛应用于照明、液晶背光等领域，也与智能照明、物联网技术等高新科技产业密切相关。常用的蓝光芯片复合黄光YAG∶Ce,3+, (Y,3,Al,5,O,12,∶Ce,3+,) 荧光粉的白光器件由于缺少红色光谱的成分，导致器件光谱较窄，显色指数较低，色温偏高。因此，红色荧光粉对改善白光LED的光色品质起到了重要作用。本文首先制备了红色碳点(量子效率28%)，通过把红色碳点与纤维素复合，制备了红色荧光粉(量子效率为18%)。该红色荧光粉与黄光YAG∶Ce,3+,荧光粉混合，封装得到暖白光。结果表明，相较于只有黄光YAG∶Ce,3+,荧光粉封装的LED，红色荧光粉掺杂之后，在460 nm蓝光芯片的激发下，白光LED的色坐标由(0.30,0.33)变化到(0.33,0.35)，色温从7 396 K下降到5 714 K，显色指数从78.2升高到82.9，实现了由色温高、显示指数低的冷白光向色温低、显色指数高的暖白光的调节。

Abstract

As a new generation of green solid-state lighting source, white light-emitting diode(LED) devices not only have been widely used in lighting, liquid crystal display(LCD) backlighting and other fields, but also are related to intelligent lighting, the Internet of Things technology and other high-tech industries. White light devices consisting of yellow emitting YAG∶Ce,3+, (Y,3,Al,5,O,12,∶Ce,3+,) phosphors and blue chip are commonly used but lacking the components of red spectrum, resulting in the device's narrow spectrum, low color rendering index(CRI) and high correlated color temperature(CCT). Therefore, red phosphors play an important role in improving the color quality of white LED. Herein, red carbon dots with 28% quantum yield(QY) are synthesized and then combined with cellulose to form red phosphors(QY≈18%). Red phosphors are mixed with commercial YAG∶Ce,3+, (Y,3,Al,5,O,12,∶Ce,3+,) to obtain warm white LED. Compared to the LED encapsulated with YAG∶Ce,3+, phosphors, the CIE color coordinate of the LED which is encapsulated with YAG∶Ce,3+, phosphors and red phosphors changes from (0.30, 033) to (0.33, 0.35), the CCT declines from 7 396 K to 5 714 K and the CRI raises from 78.2 to 82.9 under the excitation of 460 nm emitting blue chip. It achieves that cold white light-emitting diodes(WLED) with high CCT and low CRI were adjusted to warm WLED with low CCT and high CRI.

关键词

红色碳点纤维素暖白光LED照明

Keywords

red carbon dotscellulosewarm white light-emitting diodeslighting

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Key Laboratory for Biobased Materials and Energy of Ministry of Education/Guangdong Provincial Engineering Technology Research Center for Optical Agriculture， College of Materials and Energy， South China Agricultural University

Maoming Branch， Guangdong Laboratory for Lingnan Modern Agriculture

College of Horticulture， South China Agricultural University

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