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김봉우,허진혁,박진경,이성환,박현익,김성연,김준호,임상혁 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
Morphology and crystal grain size of inorganic CsPbBr3 metal halide perovskite (MHP)films arecontrollable through a diffusion-controlled anti-solvent dripping crystallization method using an antisolventmixture of toluene (Tol):isopropanol (IPA). The 8:2 (v:v) Tol:IPA anti-solvent enables theproduction of a pinhole-free CsPbBr3 MHPfilm with the smallest crystal grain size and the brightestphotoluminescence (PL). Accordingly, the 8:2 CsPbBr3 MHPfilm reveals a very uniform and strong PLmapping image. As a result, the 8:2 CsPbBr3 MHP light emitting diode (LED) exhibits12.8,7.4, and7.9 fold enhanced maximum electroluminescence (ELmax), current efficiency (CEmax), and externalquantum efficiency (EQEmax) compared to the 10:0 pristine device. The optimized 8:2 MHP LED shows anELmax of 22,298 cd/m2, CEmax of 36.65 cd/A and EQEmax of 9.64%, respectively. In addition, the 8:2 CsPbBr3MHP LED with controlled morphology and grain size has better operating stability than the pristinedevice.