Yb³⁺/Er³⁺-codoped GdBiW₂O₉ phosphors are prepared via the solid-state route for application in upconversion temperature sensors. The structural analyses indicate that all phosphors possess a single-phased orthorhombic structure. Upon the excitation of a laser wavelength of 980 nm, Yb³⁺/Er³⁺-codoped GdBiW₂O₉ phosphors emanate green emission peaks, endorsed to the emission to the ⁴I_15/2 state from the ⁴S_3/2 and ²H_11/2 states, respectively, and the weak emission (red) from the ⁴F_9/2 state to the ⁴I_15/2 state of Er³⁺ ion. The upconversion mechanism has been elucidated via the scheme of energy levels conferred from the pump power-induced upconversion characteristics. The temperature-dependent upconversion of GdBiW₂O₉ phosphors was investigated in detail along with the estimation of the stability and repeatability of the measurement. The obtained sensitivity data for the present materials with the corresponding sensing parameters show their probable outlook in temperature sensing applications.

中文翻译：

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通过上转换发光进行温度感测的有前景的Er ³⁺ / Yb ^3+-掺杂的GdBiW ₂ O ₉荧光粉

Yb ³⁺ / Er ³⁺掺杂的GdBiW ₂ O ₉荧光粉通过固态途径制备，用于上转换温度传感器。结构分析表明，所有荧光粉均具有单相正交晶结构。在激发980 nm的激光波长后，掺Yb ³⁺ / Er ^3+的GdBiW ₂ O ₉荧光粉发出绿色发射峰，并由⁴ S _3/2和⁴ S _15/2发射为⁴ I _15/2态。² H _11/2态和来自⁴ F _9/2态变为Er ³⁺离子的⁴ I _15/2态。已通过由泵功率引起的上转换特性赋予的能级方案阐明了上转换机制。对GdBiW ₂ O ₉荧光粉随温度变化的上转换以及测量的稳定性和可重复性的估计进行了详细研究。获得的具有相应传感参数的本材料的灵敏度数据显示了它们在温度传感应用中的可能前景。