一步法合成显色指数高达97的白光LED白光碳点,Advanced Science

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一步法合成显色指数高达97的白光LED白光碳点
Advanced Science ( IF 14.3 ) Pub Date : 2023-02-23 , DOI: 10.1002/advs.202206386
Zishan Yan ₁ , Tong Chen ₁ , Lingpeng Yan _{2,

3} , Xinghua Liu _{1,

3} , Jingxia Zheng _{1,

2} , Fu-de Ren ₄ , Yongzhen Yang _{1,

2} , Bin Liu _{4,

5} , Xuguang Liu _{1,

3} , Bingshe Xu _{1,

2}

Affiliation

白光发射碳点 (WCD) 作为白光发光二极管 (WLED) 中的荧光粉显示出先天优势。对于 WLED，显色指数 (CRI) 是评估其性能的最重要指标。在此，WCD 是通过偏苯三酸和o的简单一步溶剂热反应制备的-苯二胺。它由柱层析法鉴定为蓝、绿、黄、红的四个CD组成，因此白光是这四种光的叠加。四个 CD 的混合物经历 Förster 共振能量转移以诱导白光的产生。WCD 的光致发光源于碳核和表面态的协同效应。其中，碳核态在RCDs中占主导地位，酰胺含量和共轭度的增加促进了发射光谱的红移，理论计算进一步证实了这一点。此外，将WCD用作荧光粉制造WLED时，显色指数高达97，几乎是迄今为止的最高值。也可以将四个多色CD分别用作荧光粉来制作多色LED。

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One-Step Synthesis of White-Light-Emitting Carbon Dots for White LEDs with a High Color Rendering Index of 97

White-light-emitting carbon dots (WCDs) show innate advantages as phosphors in white light-emitting diodes (WLEDs). For WLEDs, the color rendering index (CRI) is the most important metric to evaluate its performance. Herein, WCDs are prepared by a facile one-step solvothermal reaction of trimellitic acid and o-phenylenediamine. It consists of four CDs identified by column chromatography as blue, green, yellow, red, and thus white light is a superposition of these four types of light. The mixture of the four CDs undergoes Förster resonance energy transfer to induce the generation of white light. The photoluminescence of WCDs originates from the synergistic effect of carbon core and surface states. Thereinto, the carbon core states dominate in RCDs, and the increase of amide contents and degree of conjugation promote the redshift of the emission spectra, which is further confirmed by theoretical calculations. In addition, a high CRI of 97 is achieved when the WCDs are used as phosphors to fabricate WLEDs, which is almost the highest value up to now. The multicolor LEDs can also be fabricated by using the four multicolor CDs as phosphors, respectively. This work provides a novel approach to explore the rapid preparation of low-cost, high-performance WCDs and CDs-based WLEDs.

更新日期：2023-02-23

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