Visible to infrared wide wavelength range luminescence of SrLaNbO: Yb/Nd/Ho phosphor under 808/980 nm excitation and temperature sensing application.

Here, the SrLaNbO: Yb/Nd/Ho phosphors are prepared through solid-state route. The upconversion (UC)/downshifting (DS) luminescence and temperature performances of all samples are investigated in detail. Under 808 nm excitation, the infrared emission band (∼2000 nm) of Ho ions is obtained. Especially, the energy transfer process of Nd → Yb → Ho has increased the emission intensity of ∼2000 nm. Moreover, the infrared emission band presents thermal enhancement. Under 980 nm excitation, the UC emission band 500-960 nm is investigated. The green and red light of Ho ion, near infrared light of Nd ions are achieved. In addition, the possible luminescence mechanism of SrLaNbO: Yb/Nd/Ho phosphor is discussed. At last, the optical temperature sensing characteristics of the phosphor are studied according to the luminescence intensity ratio (LIR) technology. The maximum relative sensitivity of SrLaNbO: Yb/Nd/Ho reaches 5.476 % K at 293 K. These results prove that the SrLaNbO: Yb/Nd/Ho phosphor presents the luminescence in infrared and visible range. The SrLaNbO:Yb/Nd/Ho phosphor also can be applied to design optical temperature sensor.