A narrow-band emitting phosphor is essential for high performance liquid crystal display (LCD) backlights. However, most of the narrow-band emitting phosphors are only realized by doping Eu or Mn ions, which limits the optional range. Especially, the discovery of narrow-band blue-emitting phosphors without resorption in the visible light region is still challenging. Herein, an emerging rare-earth free and narrow-band blue-emitting phosphor, Y₃Al₂Ga₃O₁₂:Bi³⁺, with high color purity (up to 90.9%) has been discovered via selective excitation for the first time. The luminescence properties such as photoluminescence (PL), photoluminescence excitation (PLE) and lifetime spectra were systematically investigated. The sample exhibited tunable emission ranging from red to green and then to blue under variable excitation, originating from four Bi luminescence centers. Y₃Al₂Ga₃O₁₂:Bi³⁺ exhibits a narrow-band blue emission centered at 410 nm with a full width at half maximum of 39 nm and strong absorption in the range of 260–380 nm, which matches well with the commercial near-ultraviolet (NUV) chip. What's more, the sample shows remarkable thermal stability, retaining 90.71% of its room temperature emission intensity at 420 K. In this work, a rare-earth free narrow-band blue-emitting phosphor has been discovered for the first time.

中文翻译：

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发现具有强NUV激发力的新型无稀土窄带发蓝光磷光体Y3Al2Ga3O12：Bi3 +，用于LCD LED背光源

窄带发射磷光体对于高性能液晶显示器（LCD）背光至关重要。然而，大多数窄带发射磷光体仅通过掺杂Eu或Mn离子来实现，这限制了可选范围。特别地，发现在可见光区域不吸收的窄带发蓝光的磷光体仍然是挑战。在此，已发现一种新型的无稀土且窄带发蓝光的荧光粉，Y ₃ Al ₂ Ga ₃ O ₁₂：Bi ³⁺，具有较高的色纯度（高达90.9％）。首次选择性激发。系统地研究了发光性质，例如光致发光（PL），光致发光激发（PLE）和寿命光谱。样品在可变激发下表现出从红色到绿色然后到蓝色的可调发射，其起源于四个Bi发光中心。Y ₃ Al ₂ Ga ₃ O ₁₂：Bi ³⁺具有窄带蓝色发射，中心波长为410 nm，半峰全宽为39 nm，在260-380 nm范围内具有强吸收，这与商用近紫外（NUV）芯片非常匹配。此外，该样品显示出显着的热稳定性，在420 K下仍保持其室温发射强度的90.71％。在这项工作中，首次发现了无稀土的窄带发蓝光的磷光体。