White Lght Emission from the Tb3+/Eu3+ Co-doped All-inorganic Halide Perovskite Quantum Dots in Ambient Air

In order to overcome the shortcomings in obtaining white light emission due to the anion exchange reaction from different halide perovskite quantum dots and unstable red light emission halide perovskite quantum dots, a method was used to prepare rare earth ions Tb3+/Eu3+ co-doping into perovskite quantum dots in ambient air. By adjusting the doping ratio of Tb3+/Eu3+ rare earth ions,the energy transfer from the host lattice of perovskite quantum dots to Tb3+/Eu3+ was accordingly manipulated to obtain single-component and white light emission perovskite quantum dots of(Tb,Eu):CsPbCl3 and (Tb,Eu):CsPb(Cl/Br)(3). Meanwhile,we delicately investigated the morphology,structure,luminescence performance, energy transfer mechanism and stability of quantum dots. The results show that under 365 nm laser excitation,white light emission with 1 931 Commission Internationale de l'Eclairage color coordinates was achieved in perovskite quantum dots(Tb,Eu):CsPbCl3 with different contents of Tb3+/ Eu3+ ions. When the feed ratio PbCl2:TbCl3:EuCl3 is 1:1.5:1,the quantum yield is 3.59%,which is 6 times higher than the quantum yield(0.57%)of pure CsPbCl3 quantum dots. Further research found that the(Tb,Eu):CsPbCl3 quantum dots were stored in the air for 2 months,the quantum yield was almost unchanged (3.63%), maintaining good stability. Moreover, the luminescence characteristics of the co- doped perovskite quantum dots with Tb3+ and Eu3+ synthesized with different solvents(n-octane,1-octadecene) were compared. Tb3+/Eu3+ co-doped perovskite quantum dots (Tb,Eu):CsPbCl3 ware used to achieve single-component white light emission with good stability and has certain application prospects.