Rapid Aqueous-Phase Synthesis and Photoluminescence Properties of K 0.3 Bi 0.7 F 2.4 :Ln 3+ (Ln = Eu, Tb, Pr, Nd, Sm, Dy) Nanocrystalline Particles.

Trivalent lanthanides (Ln³⁺) doped bismuth-based inorganic compounds have attracted considerable interest as promising candidates for next-generation inorganic luminescent materials. Here, a series of K_0.3Bi_0.7F_2.4 (KBF) nanocrystalline particles with controlled morphology have been synthesized through a low-temperature aqueous-phase precipitation method. Using KBF as the host matrix, Eu³⁺, Tb³⁺, Pr³⁺, Nd³⁺, Sm^3+, and Dy³⁺ ions are introduced to obtain K_0.3Bi_0.7F_2.4:Ln³⁺ (KBF:Ln) nanophosphors. The as-prepared KBF:Ln nanophosphors exhibit commendable photoluminescence properties, in which multicolor emissions in a single host lattice can be obtained by doping different Ln³⁺ ions when excited by ultraviolet light. Moreover, the morphology and photoluminescence performance of these nanophosphors remain unchanged under different soaking times in water, showing good stability in a humid environment. The proposed simple and rapid synthesis route, low-cost and nontoxic bismuth-based host matrix, and tunable luminescent colors will lead the way to access these KBF:Ln nanophosphors for appealing applications such as white LEDs and optical thermometry. [ABSTRACT FROM AUTHOR]