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基于密度函数理论的Eu3+化的设计,具有零热火性能
Shaokun Ling1, Yaxiong Wang1, Xiaoyan Qin2
1School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi 530004, China.
Inorganic chemistry
|April 4, 2024
概括
这项研究引入了新的β-NaGdF4,具有零热火 (ZTQ) 特性,用于白色发光二极管 (WLED). 在高温下,VNa缺陷增强了发光强度,提高了WLED的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 发光的光度是非常的低.
背景情况:
- 用于白色发光二极管 (WLED) 的商业光灯在工作温度升高时,发光强度下降,这种现象被称为热火.
- 解决热火对于提高WLED的效率和寿命至关重要,特别是在需要在不同热条件下稳定的光输出功率的应用中.
研究的目的:
- 调查β-NaGdF4基材料作为红光的潜力,具有零热火 (ZTQ) 特性,用于WLED.
- 通过将理论计算与实验合成和表征联系起来,阐明 ZTQ 属性背后的机制.
主要方法:
- 进行密度函数理论 (DFT) 计算,以确定β-NaGdF4中VNa缺陷的形成能量.
- 一系列的β-NaGdF4:xEu3+和β-NaGdF4:0.25Eu3+,yYb3+红光用热水方法合成.
- 用热发光 (TL) 光谱来分析VNa空位的深度和密度,并评估发光特性.
主要成果:
- DFT计算证实了β-NaGdF4中VNa缺陷的稳定存在,预测了它们在实现ZTQ特性中的作用.
- 合成的β-NaGdF4:0.25Eu3+和β-NaGdF4:0.25Eu3+,0.005Yb3+体在分别303483 K和303523 K的温度范围内表现出ZTQ的特性.
- 实验结果表明,存储在VNa空位中的电子被激发到Eu3+能量水平,弥补高温下发光强度的损失,并导致增强发光.
结论:
- 证实VNa空缺的存在是β-NaGdF4:Eu3+和β-NaGdF4:Eu3+,Yb3+中零热火 (ZTQ) 属性的来源.
- 这些体显示出作为WLED可靠的红光源的潜力,提供高抗热火能力.
- 使用这些光剂制造的WLED实现了高颜色染指数 (CRI) 和相关色温 (CCT) 值,表明它们的实际应用.
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