Charge compensation-assisted photoluminescence in an efficient K2SrP4O12:Sm3+ phosphor
Xiaoqin Tang, Jintao Xie, Xiaoting Huang, Asif Ali Haider, Jinli Chen, Zhouyan Li, Yuting Li, Mincheng Jiang, Yujia Xu, Heyun Zhao, Guanhao Zhou, Li Ran, Jing Zhu
Abstract
Benefiting from the visible light emission behavior of the Sm 3+ activator, Sm 3+ -incorporated inorganic phosphors have received considerable interest in solid-state lighting areas. Nevertheless, so far, highly efficient and heat-resistant optical materials activated with Sm 3+ are scarce. In this work, a series of new orange-red-emitting phosphors K 2 SrP 4 O 12 (KSPO):Sm 3+ ,A + (A + = Li, Na, and K) were prepared by charge compensation strategy. Under 405 nm excitation, the phosphors exhibit strong orange-red emission. The incorporation of alkali metals A + effectively compensates for the vacancy defects caused by the non-equivalent substitution of Sm 3+ for Sr 2+ , improving the luminescent performance. In particular, the Na + -compensated phosphor exhibits a luminescence intensity 1.92 times greater than that of the uncompensated sample due to the fact that Na + and Sr 2+ have close ionic radii. It has demonstrated excellent internal quantum efficiency (37.1 %), high color purity (98.5 %), and high thermostability (94 %@423 K), significantly surpassing the majority of reported Sm 3+ -doped phosphors. In addition, a representative KSPO:0.03Sm 3+ ,0.03Na + phosphor is used to prepare W-LEDs, showing potential for solid-state lighting. • K 2 SrP 4 O 12 :Sm 3+ and charge-compensated phosphors were firstly reported. • Na + compensation induces significant improvements in IQE and heat resistance. • The fabricated W-LEDs outputs satisfactory white light (0.3214, 0.3169).