A New Lead‐Free Cs12Zn3.1Mn0.9Cl20 Perovskite Material for Light‐Emitting Diodes

Lead‐containing halide perovskite materials’ toxicity and instability severely restrict their ability to be used in further commercial applications. Herein, a new lead‐free and thermal stable Cs 12 Zn 3.1 Mn 0.9 Cl 20 perovskite material obtained via a simple room temperature precipitation method is reported. A high photoluminescence quantum yield of 83.1% can be obtained from the perovskite material Cs 12 Zn 3.1 Mn 0.9 Cl 20 , which is typically made up of tetragonal vertices and is excitable by ultraviolet (UV) light. More importantly, the relative photoluminescence (PL) intensity still retains roughly 60% of that at 30 °C when the temperature continuously increases to 130 °C. The time‐resolved PL decay lifetime is calculated to be 3.40 ms. With the color coordinates at (0.208 and 0.683) provided by the Commission Internationale de L’Eclairage (CIE), a bright green light‐emitting diode (LED) can be created using the green‐emitting Cs 12 Zn 3.1 Mn 0.9 Cl 20 perovskite material. Meanwhile, a warm white LED device with the CIE color coordinates at (0.374, 0.289) and a low color‐correlated temperature of 3245 K is fabricated by the Cs 12 Zn 3.1 Mn 0.9 Cl 20 perovskite material combining with a commercial blue and red‐emitting phosphors on a UV InGaN chip.