Wei Yi, Yang Hang, Gao Zhiyu, Liu Yixin, Xing Gongcheng, Dang Peipei, Kheraif Abdulaziz A Al, Li Guogang, Lin Jun, Liu Ru-Shi
Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Materials Science and Chemistry China University of Geosciences Wuhan Hubei 430074 P. R. China.
State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 P. R. China.
Adv Sci (Weinh). 2020 Feb 29;7(8):1903060. doi: 10.1002/advs.201903060. eCollection 2020 Apr.
Nowadays, red phosphor plays a key role in improving the lighting quality and color rendering index of phosphor-converted white light emitting diodes (w-LEDs). However, the development of thermally stable and highly efficient red phosphor is still a pivotal challenge. Herein, a new strategy to design antithermal-quenching red emission in Eu, Mn-codoped phosphors is proposed. The photoluminescence intensity of MgY GeO:Eu, Mn (0 ≤ ≤ 1) phosphors continuously enhances with rising temperature from 298 to 523 K based on Eu → Mn energy transfer. For MgEuGeO:Mn sample, the integrated intensity at 523 K remarkably reaches 120% of that at 298 K. Interestingly, through codoping Eu and Mn in MgYGeO, the photoluminescence color is controllably tuned from orangish-red (610 nm) to deep-red (660 nm) light by changing Eu concentration. The fabricated w-LEDs exhibit superior warm white light with low corrected color temperature (CCT = 4848 K) and high color rendering index ( = 96.2), indicating the promising red component for w-LED applications. Based on the abnormal increase in antistokes peaks of Mn with temperatures, MgEuGeO:Mn phosphor also presents a potential application in optical thermometry sensors. This work initiates a new insight to construct thermally stable and spectra-tunable red phosphors for various optical applications.
如今，红色荧光粉在提高磷光转换白光发光二极管（w-LED）的照明质量和显色指数方面起着关键作用。然而，开发热稳定且高效的红色荧光粉仍然是一个关键挑战。在此，提出了一种在Eu、Mn共掺杂荧光粉中设计抗热猝灭红色发射的新策略。基于Eu→Mn能量转移，MgY GeO:Eu、Mn（0≤ ≤1）荧光粉的光致发光强度在温度从298 K升至523 K时持续增强。对于MgEuGeO:Mn样品，523 K时的积分强度显著达到298 K时的120%。有趣的是，通过在MgYGeO中共掺杂Eu和Mn，通过改变Eu浓度可将光致发光颜色从橙红色（610 nm）可控地调至深红色（660 nm）光。制备的w-LED呈现出具有低校正色温（CCT = 4848 K）和高显色指数（ = 96.2）的优异暖白光，表明其在w-LED应用中具有作为红色组分的潜力。基于Mn的反斯托克斯峰随温度异常增加，MgEuGeO:Mn荧光粉在光学温度传感器中也具有潜在应用。这项工作为构建用于各种光学应用的热稳定且光谱可调的红色荧光粉开创了新的思路。
