Wang Haiyan,Chen Jin,Sun Yu,Wang Fengchao,Yang Jing,Zhang Canyun,Kong Jinfang,Li Lan
Lead-free halide double perovskite Cs 2 AgInCl 6 has been extensively studied in recent years due to the lead toxicity and poor stability of common lead halide perovskites. In this study, sodium (Na + ) and bismuth (Bi 3+ ) doped into Cs 2 AgInCl 6 double perovskite, then Cs 2 Ag 1− x Na x In 1 − y Bi y Cl 6 films with broadband warm-yellow emissions were achieved by the blade coating method. Herein, Na and Bi content were changed as variables at a series of parameter optimization experiments, respectively. In the Cs 2 Ag 1− x Na x In 1 − y Bi y Cl 6 systems, Na + broke the parity-forbidden transition of Cs 2 AgInCl 6 , and Bi 3+ suppressed non-radiative recombination. The partial replacement of Ag + with Na + ions and doping with Bi 3+ cations were crucial for increasing the intensity of the PL emission. The experimental results showed that the photoluminescence quantum yield of the Cs 2 Ag 0.4 Na 0.6 In 0.8 Bi 0.2 Cl 6 film was 66.38%, which was the highest data among all samples. It demonstrated remarkable stability under heat and ultraviolet conditions. After five thermal cycles, the PL intensity of the Cs 2 Ag 0.4 Na 0.6 In 0.8 Bi 0.2 Cl 6 film is only reduced to approximately 5.7% of the initial value. After 720 h continuous ultraviolet irradiation, there occurred 31.9% emission decay of the film.
In recent years, the lead-free halide perovskite has been extensively studied due to the the lead toxicity and poor stability of lead halide perovskite. Cs2AgInCl6 has shown great potential to replace lead halide perovskites in optoelectronic applications. However, this perovskite synthesis method needs to involve high temperature, the synthesis conditions are relatively harsh. In this work, a simple solid-phase grinding method was employed to prepare Na+ and Bi3+ doped perovskite Cs2Ag1-xNaxIn1-yBiyCl6 with systematically characterization of both the structure and optical performance. The experimental results showed that a photoluminescence quantum yield (PLQY) of 13.1% was achieved by breaking the parity-forbidden transition through 4% Bi³⁺ doping. Subsequently, the incorporation of 60% Na⁺ suppressed non-radiative transitions and increased the PLQY to 56.9%. The Cs2Ag0.4Na0.6In0.96Bi0.04Cl6 samples were encapsulated on ultraviolet (UV) LED chips to obtain warm-yellow LED with good performances, which shows that promising applications in the LED field.
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