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Rare-Earth Free Self-Activated Graphene Quantum Dots and Copper-Cysteamine Phosphors for Enhanced White Light-Emitting-Diodes under Single Excitation.
Scientific Reports ( IF 3.8 ) Pub Date : 2017-Oct-09 , DOI: 10.1038/s41598-017-13404-1 Wubin Dai 1 , Yifeng Lei 2 , Man Xu 1 , Pei Zhao 1 , Zhanhui Zhang 1 , Jia Zhou 1
Scientific Reports ( IF 3.8 ) Pub Date : 2017-Oct-09 , DOI: 10.1038/s41598-017-13404-1 Wubin Dai 1 , Yifeng Lei 2 , Man Xu 1 , Pei Zhao 1 , Zhanhui Zhang 1 , Jia Zhou 1
Affiliation
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Rare-earth (RE) based phosphors are attractive due to their potential applications. However, owing to the resource issue, these kinds of phosphors are expensive and costly. On the contrary, as for phosphor-convert white light-emitting-diodes (pc-WLEDs), a solution-processed tunable warm white emission LED composite is fabricated in this study under single excitation, with both RE free phosphors graphene quantum dots (GQDs) and Copper-Cysteamine (Cu-Cy). By using microwave-assisted wet-chemical method and with graphite as raw material, cold white fluorescence of the GQDs is obtained. Cu-Cy which shows intense photoluminescence in the red region has the structure where both the thio and amine groups connected with copper and forming cysteamine. Warm white light is achieved by mixing the two self-activated RE free phosphors at the weight ratio of 1: 1.7 under the excitation at 365 nm. The designed optimal LED device has the properties of CIE (x, y) = (0.341, 0.327), T = 4436 K, R = 87.9 EQE = 0.31%. The experimental results demonstrate that RE free phosphor(s) excited under a single chip can open up a new avenue to develop much lower device for warm WLEDs.
中文翻译：
用于单激发下增强型白光发光二极管的无稀土自激活石墨烯量子点和铜半胱胺磷光体。
稀土（RE）基荧光粉因其潜在的应用而颇具吸引力。然而，由于资源问题，此类荧光粉价格昂贵，成本较高。相反，对于磷光体转换白光发光二极管（pc-WLED），本研究在单次激发下制造了一种溶液处理的可调谐暖白光发射 LED 复合材料，同时使用无稀土磷光体石墨烯量子点（GQD） ）和铜半胱胺（Cu-Cy）。采用微波辅助湿化学法，以石墨为原料，获得了冷白荧光的GQDs。 Cu-Cy 在红色区域显示出强烈的光致发光，其结构中硫基和胺基均与铜连接并形成半胱胺。将两种自激活无稀土荧光粉以1:1.7的重量比混合，在365 nm激发下得到暖白光。设计的最佳LED器件具有CIE(x,y)=(0.341,0.327)、T=4436K、R=87.9、EQE=0.31%的特性。实验结果表明，在单芯片下激发的无稀土荧光粉可为开发用于暖色 WLED 的低得多的器件开辟一条新途径。
更新日期：2017-10-09
中文翻译：
用于单激发下增强型白光发光二极管的无稀土自激活石墨烯量子点和铜半胱胺磷光体。
稀土（RE）基荧光粉因其潜在的应用而颇具吸引力。然而，由于资源问题，此类荧光粉价格昂贵，成本较高。相反，对于磷光体转换白光发光二极管（pc-WLED），本研究在单次激发下制造了一种溶液处理的可调谐暖白光发射 LED 复合材料，同时使用无稀土磷光体石墨烯量子点（GQD） ）和铜半胱胺（Cu-Cy）。采用微波辅助湿化学法，以石墨为原料，获得了冷白荧光的GQDs。 Cu-Cy 在红色区域显示出强烈的光致发光，其结构中硫基和胺基均与铜连接并形成半胱胺。将两种自激活无稀土荧光粉以1:1.7的重量比混合，在365 nm激发下得到暖白光。设计的最佳LED器件具有CIE(x,y)=(0.341,0.327)、T=4436K、R=87.9、EQE=0.31%的特性。实验结果表明，在单芯片下激发的无稀土荧光粉可为开发用于暖色 WLED 的低得多的器件开辟一条新途径。
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