Zhong Xue, Wang Tianman, Li Yuelan, Yu Yan, Chen Long, Liao Sen, Huang Yingheng, Long Jinqiao
School of Chemistry and Chemical Engineering, Guangxi University Nanning Guangxi 530004 China
Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University Nanning Guangxi 530004 China.
RSC Adv. 2021 Jun 29;11(37):23023-23035. doi: 10.1039/d1ra02449c. eCollection 2021 Jun 25.
Herein, a series of NSF:0.05Mn,0.04K@GQD (NSF: NaSiF, GQDs: Cl-containing graphene quantum dot) phosphors was prepared. Double enhancement effects on the luminescent intensity and thermal stability triggered by the GQD coating were observed for the optimal sample as follows: (a) its PL intensity was 1.72 times that of the uncoated control sample and (b) its luminescent thermal stability was greatly enhanced, with integrated PL intensities of 120, 150 and 180 °C to 179.7%, 175.8%, and 119.3% of the initial value at 25 °C, respectively. It is proposed that the above-mentioned behaviors involve a change in some of the thermal energy into light energy a phonon-induced mechanism. The thermal stability analysis results showed that the optimal sample is suitable for application in high-power WLEDs. Specifically, warm white light with a low correlated color temperature, high luminescent efficiency and high color rendering index was obtained from the prototype WLEDs using the optimal sample as a red-emitting component.
在此，制备了一系列NSF:0.05Mn,0.04K@GQD（NSF：NaSiF，GQDs：含氯石墨烯量子点）荧光粉。对于最佳样品，观察到GQD涂层对发光强度和热稳定性有双重增强作用，具体如下：(a) 其PL强度是未涂层对照样品的1.72倍；(b) 其发光热稳定性大大提高，在120、150和180°C时的积分PL强度分别为25°C初始值的179.7%、175.8%和119.3%。有人提出上述行为涉及将部分热能转化为光能——一种声子诱导机制。热稳定性分析结果表明，最佳样品适用于高功率白光发光二极管。具体而言，使用最佳样品作为红色发光组件的原型白光发光二极管获得了具有低相关色温、高发光效率和高显色指数的暖白光。
