[15a-302-1~10] 12.4 Organic light-emitting devices and organic transistors

▲ [15a-302-4] Centrifugal Coated Quasi-2D CsPb₂Br₅ Emitter Layer for Perovskite Light-Emitting Diodes and Lasing

〇Chuanjiang Qin^1,2, Toshinori Matsushima^1,2, Atura. S. D Sandanayaka^1,2, Chihaya Adachi^1,2 (1.OPERA Kyushu Univ., 2.JST ERATO)

Keywords:perovskite, light-emitting diode, lasing

Low-cost and room-temperature solution-processed inorganic two dimensional perovskites with strong exciton binding energy, chemistry stability, and color-tunable photoluminescence are promising for light-emitting diodes (LEDs) and laser application. However, efficient pure inorganic quasi-2D perovskite based PeLEDs have not been realized yet. Here centrifugal-coated quasi-2D CsPb₂Br₅ films from nanocrystal colloidal are successfully developed. This technique allows for the formation of very thin continuous layers of high-quality quasi-2D CsPb₂Br₅ which is challenging for traditional spin-coating methods. Through thickness control process and without additional treatment, we obtained a compact and uniform CsPb₂Br₅ emitter layer with a photoluminescence quantum yield of 35% and demonstrated perovskite LEDs with good external quantum efficiency of 2.6%. We in-situ studied the carrier traps of complete CsPb₂Br₅ based LEDs and observed two types of traps using thermally stimulated current technique. Further, a random lasing from centrifugal-coated quasi-2D CsPb₂Br₅ film was also demonstrated with a promising low threshold.