Constructing a phosphor with multifunctional applications is an imperative challenge. Especially, highly thermostable luminescence of phosphor is indispensable for stable white-light-emitting diodes (LEDs). Nevertheless, good thermal quenching resistance behavior is unfavorable for a fluorescence intensity ratio (FIR)-based optical temperature sensor. Herein, a highly thermostable Ba₃(ZnB₅O₁₀)PO₄ (BZBP)-based phosphor is successfully achieved via replacing Ba²⁺ with Dy³⁺, demonstrating simultaneously promising lighting and thermometry utilizations. Under the excitation of 350 nm, the title phosphor only loses 12% of the initial intensity when the temperature is up to 473 K, ensuring sufficient luminescence thermostability for white-LED lighting. The white-LED device fabricated using the title phosphor emits high-quality white light with a high color rendering index (R_a = 93) and low correlated color temperature (CCT = 3996 K). Meanwhile, the yellow and blue emission intensities demonstrate a downtrend difference with rising temperature. Temperature sensing properties are assessed through FIR technology. The maximal relative sensitivity reaches as high as 0.0379 K^–1 at 298 K. These results reveal that the title phosphor has a great potential for indoor lighting and thermometry applications.

中文翻译：

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高耐热Dy3+激活硼磷酸盐荧光粉的研究

构建具有多功能应用的荧光粉是一项迫切的挑战。特别是，荧光粉的高度热稳定性发光对于稳定的白光发光二极管（LED）是必不可少的。然而，良好的抗热猝灭性能对于基于荧光强度比（FIR）的光学温度传感器来说是不利的。在此，通过用Dy ^{3+取代Ba 2+}成功实现了基于Ba ₃ (ZnB ₅ O ₁₀ )PO ₄ (BZBP) 的高热稳定性荧光粉，同时展示了有前景的照明和测温用途。在350 nm的激发下，当温度高达473 K时，标题荧光粉仅损失初始强度的12%，确保了白光LED照明足够的发光热稳定性。使用标题荧光粉制造的白光 LED 器件可发出具有高显色指数 ( Ra = ₉₃ ) 和低相关色温 (CCT = 3996 K) 的高质量白光。同时，黄色和蓝色发射强度随温度升高呈现下降趋势差异。温度传感特性通过 FIR 技术进行评估。最大相对灵敏度在 298 K 时高达 0.0379 K ^–1。这些结果表明，该荧光粉在室内照明和测温应用中具有巨大的潜力。