一种LED用红色荧光粉BaZn2(BO3)2：Eu3+的合成与发光性能研究

通过高温固相法制得双峰可调节本征半导体发光BaZn₂（BO₃）₂：Eu³⁺荧光粉，此类荧光粉在300~400 nm的紫外波段有很强的吸收。在375 nm的紫外光激发下，该荧光粉产生了两个宽带的发射峰，分别位于550 nm和615 nm处。并且，在395 nm的紫光激发下，荧光粉会由于Eu³⁺离子的⁵D₀→⁷F₂电偶极跃迁产生一个位于615 nm的强宽发射峰，这表明Eu³⁺离子占据了反演对称中心的位置，取代了BaZn₂（BO₃）₂中部分的Ba²⁺离子。当Eu³⁺的摩尔分数达到10%时，发生浓度猝灭。在不同浓度的Eu³⁺离子的掺杂下，BaZn₂（BO₃）₂：Eu³⁺荧光粉的发光从黄色延伸到红色，实现了荧光粉的色度可调。

Synthesis and Luminescence Properties of Red Phosphor BaZn2(BO3)2: Eu3+ for Light-emitting Diode

A two-peak adjustable semiconductor luminescent material BaZn₂(BO₃)₂:xEu³⁺ phosphor was prepared by high temperature solid state method. The phosphor has a strong absorption in the ultraviolet band in the range of 300 to 400 nm. With the excitation of 375 nm, this phosphor exhibits two broad emission bands, peaked at 550 and 615 nm. And under the excitation of 393 nm, this phosphor exhibits a strong broad emission band, peaked at 615 nm due to the ⁵D₀→⁷F₂ electric dipole transition of Eu³⁺, which indicates that Eu³⁺ occupies an anti-inversion symmetry, and partly replaces the divalent Ba²⁺ in the BaZn₂(BO₃)₂ lattice. When the mole fraction of Eu³⁺ reaches 10%, the concentration quenching occurs. The color hue of BaZn₂(BO₃)₂:xEu³⁺ phosphors under different doped concentrations of Eu³⁺ ions can be tuned from yellow to red.