Research On The Optical Properties And Temperature Sensing Effect Of Tb³⁺ Doped CsPbX₃ Nanocrystals Glass

Owing to simple preparation process,controllable morphology and size,high photoluminescence quantum efficiency,and photoelectric characteristics of adjustable luminescence wavelength,all-inorganic CsPbX₃ perovskite have grasped great attention from researchers in recent years.However,water,ultraviolet light,temperature or oxygen can easily affect the stability of perovskite nanocrystals and cause fluorescence quenching.Therefore,improving the stability of CsPbX₃ under the premise of ensuring its excellent optical performance has become a research hotspot.In this paper,a series of CsPbX₃ perovskite nanocrystals glasses were prepared.The results prove that the doping of Tb³⁺improves the quantum yield and stability.It also has good application prospects in illumination display and optical temperature detection.The specific research content is as follows:1.A series of CsPbI₃ perovskite nanocrystal glass samples with different Tb³⁺doped concentrations were prepared using traditional high-temperature melting methods and in-situ crystallization methods.When the molar concentration of Tb³⁺doping is 1.41%,the double-peak emission of Tb³⁺and CsPbI₃can be clearly found.Taking advantage of the difference in sensitivity of the luminescence to temperature,the relationship between the fluorescence intensity ratio of the two luminescence to the reciprocal of temperature in the temperature range of 80-480 K was studied.The applicability of 1.41%Tb³⁺:CsPbI₃ nanocrystal glass in optical temperature detection is determined and the absolute sensitivity and relative sensitivity can reach up to 0.034 K^-1 and 1.78%K^-1,respectively.2.A series of 0.33%Tb:CsPbX₃ nanocrystal glasses were prepared by the same methods.Matching the narrowband emission 0.33%Tb:Cs Pb Br₃and 0.33%Tb:Cs Pb Br I₂ glass with the blue chip,the white light was obtained with luminous efficiency is 48.52 lm/W,the color temperature is5827 K,the color rendering index is 83,and the color coordinates are（0.32,0.33）.In addition,the color gamut of the matched monochromatic luminous color coordinates accounts for about 120%of the NTSC standard,which greatly promotes the optical display of the wide color gamut.