Abstract: The rapid development of modern completely artificial light-controlled plant growth requires the light source increasingly stringent. Blue-violet phosphor with high luminous intensity and good thermal stability is the key material for plant growth. Herein, narrow-band blue-violet Zn₃B₂O₆∶xBi³⁺ (0≤x≤0.03) phosphor with excellent thermal stability was synthesized by solid-state reaction. The results of XRD and energy spectra analysis show that Bi³⁺ successfully entered Zn₃B₂O₆ lattice. The fluorescence spectrum of Zn₃B₂O₆∶Bi³⁺ phosphor shows narrow-band blue-violet light at 430 nm (³P₁~¹S₀), and the full width at half maximum is only 56 nm. The optimal Bi³⁺ doping concentration is 0.02. According to the excitation spectrum shape and the lifetime decay behavior, it is proved that Bi³⁺ only occupies Zn sites in Zn₃B₂O₆. The emission peak intensity and integrated area of Zn₃B₂O₆∶0.02Bi³⁺ phosphor at 423 K are both 85% of those at room temperature, indicating that the sample has excellent thermal stability and may have potential application in high-temperature devices. The emission spectrum of Zn₃B₂O₆∶0.02Bi³⁺ phosphor accounts for 70.4% and 84.6% of the absorption spectra (370~525 nm) of chlorophyll a/b, respectively, indicating the potential application of as-prepared blue-violet phosphors in the field of plant growth.

Key words: Zn₃B₂O₆, thermal stability, blue-violet phosphor, Bi³⁺, luminescent material, plant growth