新型宽带近红外BaSnO3:Fe3+荧光粉的特性研究

Luminescence Properties of a Novel Broadband Near-Infrared Phosphor BaSnO3：Fe3+

摘要:

宽带近红外荧光粉转换的近红外LED光源广泛应用于生物医学、物性分析及夜视等领域中，而Fe³⁺由于具有生物环境友好型特点，被视为一种有巨大潜力用于开发新型宽带近红外荧光粉的激活离子。采用高温固相法合成了一款Fe³⁺掺杂的新型近红外荧光粉BaSnO₃:Fe³⁺，并对Fe³⁺宽带近红外发光机理进行了研究。结果表明：荧光粉BaSnO₃:Fe³⁺在波长380 nm的近紫外光激发下，发射出750—1 150 nm的宽带近红外光，其峰值位于896 nm处、半高宽为105 nm；BaSnO₃:Fe³⁺在380 nm处的电子跃迁对应于⁶A₁(⁶S)→⁴E(⁴D)的跃迁，而在896 nm处的电子跃迁对应于⁴T₁(⁴G)→⁶A₁(⁶S)的跃迁；当Fe³⁺掺杂浓度（摩尔分数）达到0.03%时，其发射强度达到最大、激活能约为0.657 eV。说明，将所合成的材料封装成宽带近红外LED器件，可实现夜视照明。

Abstract:

The near-infrared LED light source converted by broadband near-infrared phosphors is widely used in the fields of biomedicine， physical property analysis and night vision. Fe³⁺ is considered as an activating ion with great potential for developing novel broadband NIR phosphors due to its bioenvironmental friendliness. In this paper， a new Fe³⁺-doped near-infrared phosphor BaSnO₃：Fe³⁺ was synthesized by high temperature solid-state method. With 380 nm near ultraviolet light excitation， the phosphor emitted broadband near infrared light from 750 nm to 1 150 nm， with a peak value at 896 nm and a full width at half maximum of 105 nm. It was confirmed that the electron transition of BaSnO₃：Fe³⁺ at 380 nm corresponded to the ⁶A₁（⁶S）→⁴E（⁴D） transition， while the emission at 896 nm corresponded to the ⁴T₁（⁴G）→⁶A₁（⁶S） transition. Emission intensity of the phosphors reached the maximum when the concentration of Fe³⁺ was 0.03 mol%. The thermal activation energy was around 0.657 eV by testing the variable temperature spectrum. According to the experimental results， the mechanism of Fe³⁺ broadband near infrared luminescence was discussed. Finally， the synthesized materials were packaged into broadband near-infrared LED devices， and the applications of night vision lighting were realized.