Xie Jing, Li Liang, Zhong Yue, Su Tao, Wang Wenming, Pan Yan, Wei Xiantao, Li Yong
School of Microelectronics & Data Science, Anhui University of Technology, Maanshan 243000, China.
School of Physics and Optoelectronics, South China University of Technology, Guangdong 510640, China.
Phys Chem Chem Phys. 2024 Aug 14;26(32):21832-21840. doi: 10.1039/d4cp02359e.
Self-activated phosphors have attracted considerable attention due to their low synthesis temperature, high excitation threshold, and broad emission spectrum. And self-activated tungstate phosphors are distinguished by their low cost and stable chemical properties. Generally, it is difficult to observe luminescence from tungstate phosphors at room temperature. Furthermore, blue-emitting tungstate phosphors with high quantum efficiency are rarely reported. In this study, we succeeded in discovering high quantum-efficiency bluish-white-emitting Li(MgZn)WO phosphors and investigating their detailed crystal structures. Upon near-ultraviolet excitation at 266 nm, these phosphors exhibit a broadband emission peak. The red shift of emission is slight with increasing Zn content in Li(MgZn)WO. A highly compact octahedral [WO] unit is observed in the Li(MgZn)WO phosphors. The phosphors exhibit high internal quantum efficiencies (IQEs) of 68.70% (M = Mg), 43.90% (M = MgZn), and 22.90% (M = Zn), respectively. This study provides a bluish-white-emitting tungstate phosphor with high quantum efficiency.
自激活荧光粉因其合成温度低、激发阈值高和发射光谱宽而备受关注。自激活钨酸盐荧光粉以其低成本和稳定的化学性质而著称。一般来说，在室温下很难观察到钨酸盐荧光粉的发光。此外，具有高量子效率的蓝色发射钨酸盐荧光粉鲜有报道。在本研究中，我们成功发现了具有高量子效率的蓝白色发光Li(MgZn)WO荧光粉，并对其详细的晶体结构进行了研究。在266 nm的近紫外激发下，这些荧光粉呈现出一个宽带发射峰。随着Li(MgZn)WO中Zn含量的增加，发射峰的红移很小。在Li(MgZn)WO荧光粉中观察到一个高度紧凑的八面体[WO]单元。这些荧光粉的内量子效率（IQE）分别为68.70%（M = Mg）、43.90%（M = MgZn）和22.90%（M = Zn）。本研究提供了一种具有高量子效率的蓝白色发光钨酸盐荧光粉。
