Visible to infrared wide wavelength range luminescence of Sr2LaNbO6: Yb3+/Nd3+/Ho3+ phosphor under 808/980 nm excitation and temperature sensing application

Here, the Sr 2 LaNbO 6 : Yb 3+ /Nd 3+ /Ho 3+ 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 3+ ions is obtained. Especially, the energy transfer process of Nd 3+  → Yb 3+  → Ho 3+ 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 3+ ion, near infrared light of Nd 3+ ions are achieved. In addition, the possible luminescence mechanism of Sr 2 LaNbO 6 : Yb 3+ /Nd 3+ /Ho 3+ 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 Sr 2 LaNbO 6 : Yb 3+ /Nd 3+ /Ho 3+ reaches 5.476 % K −1 at 293 K. These results prove that the Sr 2 LaNbO 6 : Yb 3+ /Nd 3+ /Ho 3+ phosphor presents the luminescence in infrared and visible range. The Sr 2 LaNbO 6 :Yb 3+ /Nd 3+ /Ho 3+ phosphor also can be applied to design optical temperature sensor.