When activated by Dy³⁺, Na_0.25K_0.25Bi_0.50TiO₃ (NKBT), piezoelectric powders show strong luminescence in the blue and yellow spectral range. Emissions of this material can be effectively utilized for both luminescence intensity ratio and lifetime-based readouts of temperature. Photoluminescence measurements over a temperature range of 293–483 K show that the luminescence intensity ratio temperature readout has maximal relative sensitivity of 1.93% K⁻¹ at 380 K, while the relative sensitivity of the lifetime temperature readout reaches 1.1% K⁻¹ at 480 K. For this study, materials were synthesized by a solid-state reaction using TiO₂, Bi₂O₃, Na₂CO₃, K₂CO₃ and Dy₂O₃ as precursors. X-ray diffraction measurements showed that the NKBT sample crystallized in the A-site substituted distorted perovskite rhombohedral structure (R3c symmetry). The photoluminescence spectra showed characteristic emission bands of Dy³⁺ ions centered at 457 nm (⁴I_15/2 → ⁶H_15/2), 478 nm (⁴F_9/2 → ⁶H_15/2), 574 nm (⁴F_9/2 → ⁶H_13/2) and 663 nm (⁴F_9/2 → ⁶H_11/2). The ratio of emissions from ⁴F_9/2 and ⁴I_15/2 excited states to the ⁶H_15/2 ground state was used as a luminescence intensity ratio indicator of temperature, while the decay of emission from ⁴F_9/2 → ⁶H_13/2 transition was used as a lifetime indicator of temperature. CIE coordinates x = 0.326 and y = 0.361 calculated from room temperature emission spectra show the perspective of this material for use in white light emission devices.

当被Dy ³⁺，Na _0.25 K _0.25 Bi _0.50 TiO ₃（NKBT）活化时，压电粉末在蓝色和黄色光谱范围内显示出强发光性。这种材料的发射可以有效地用于发光强度比和基于寿命的温度读数。在293–483 K温度范围内的光致发光测量表明，发光强度比温度读数在380 K时的最大相对灵敏度为1.93％K ^-1，而寿命温度读数的相对灵敏度在480 K时达到1.1％K ^-1。 K.对于本研究，材料是使用TiO ₂通过固相反应合成的，Bi ₂ O ₃，Na ₂ CO ₃，K ₂ CO ₃和Dy ₂ O ₃作为前体。X射线衍射测量表明，NKBT样品在A位取代的扭曲钙钛矿菱面体结构中结晶（R 3 c对称）。光致发光光谱表明的Dy特性发射带³⁺离子为中心在457纳米（⁴我_15/2  →  ⁶ ħ _15/2），478纳米（⁴ ˚F _9/2  →  ⁶ ħ _15/2），574纳米（⁴ ˚F _9/2  →  ⁶ ħ _13/2）和663纳米（⁴ ˚F _9/2  →  ⁶ ħ _11/2）。排放的比例⁴ ˚F _9/2和^4个我_15/2到激发态⁶ ħ _15/2基态被用作温度的发光强度比的指标，而从发射的衰变⁴ ˚F _9/2  →  ⁶ H _13/2跃迁用作温度的寿命指标。CIE坐标x  = 0.326和 根据室温发射光谱计算得出的y = 0.361，显示了这种材料用于白光发射器件的透视图。