Naphthyl-modified graphitic carbon nitride: Preparation and application in light-emitting diodes
Naphthyl-modified graphitic carbon nitride: Preparation and application in light-emitting diodes
复制标题
萘基改性石墨氮化碳的制备及其在发光二极管中的应用
DOI：
10.1016/j.jlumin.2022.118734
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发表时间：
2022-01-20
影响因子：
3.6
通讯作者：
Wang, Zhengliang
中科院分区：
文献类型：
--
作者：
Tang, Huaijun;Chen, Qiuhong;Wang, Zhengliang
A series of naphthyl-modified graphitic carbon nitride were prepared by using melamine, cyanuric acid as precursors and 6-(naphthalen-2-yl)-1,3,5-triazine-2,4-diamine as a molecular dopant. When their mass ratio was 20:20:1, the product (g-C3N4-Naphth20:20:1) showed the best photoluminescence performances. The emission spectrum of g-C3N4-Naphth20:20:1 was mainly at 410-650 nm and much wider than that of bulk g-C3N4 (mainly at 410-550 nm), relative to bulk g-C3N4, the maximum emission wavelength (lambda(em,max)) changed from 455 nm to 485 nm, the light color correspondingly changed from deep blue to blue-green, the PL efficiency increased from 5.1% to 11.3%. Excited by ultraviolet chips (lambda(em,max) = 365 nm), a series of LEDs using g-C3N4-Naphth20:20:1 blended in epoxy resin at 4.0 wt% together with red-emitting SrAlSiN3:Eu2+ at x wt-% (x = 0.08, 0.12, 0.16, and 0.20) as phosphors were fabricated. When x = 0.08, 0.12, 0.16, the LEDs emitted neutral white light, their correlate color temperatures (CCT) were 5277 K, 4602 K and 3794 K, color rendering indexes (CRI) were 85.4, 88.1 and 79.7, respectively. When x = 0.20, it was a warm white LED, its CCT was 3312 K and CRI was 83.3. The results suggested the naphthyl-modified g-C3N4 can be used as efficient metal-free phosphors for LEDs.
