title: Shape-Controlled Synthesis of All-Inorganic CsPbBr3Perovskite Nanocrystals with Bright Blue Emission.
abstract: We developed a colloidal synthesis of CsPbBr3perovskite nanocrystals (NCs) at a relative low temperature (90 °C) for the bright blue emission which differs from the original green emission (∼510 nm) of CsPbBr3nanocubes as reported previously. Shapes of the obtained CsPbBr3NCs can be systematically engineered into single and lamellar-structured 0D quantum dots, as well as face-to-face stacking 2D nanoplatelets and flat-lying 2D nanosheets via tuning the amounts of oleic acid (OA) and oleylamine (OM). They exhibit sharp excitonic PL emissions at 453, 472, 449, and 452 nm, respectively. The large blue shift relative to the emission of CsPbBr3bulk crystal can be ascribed to the strong quantum confinement effects of these various nanoshapes. PL decay lifetimes are measured, ranging from several to tens of nanoseconds, which infers the higher ratio of exciton radiative recombination to the nonradiative trappers in the obtained CsPbBr3NCs. These shape-controlled CsPbBr3perovskite NCs with the bright blue emission will be widely used in optoelectronic applications, especially in blue LEDs which still lag behind compared to the better developed red and green LEDs.
authors.affiliation: Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education , Beijing, 100044, China.|Institute of Optoelectronics Technology, Beijing Jiaotong University , Beijing, 100044, China.
authors.forename: Zhiqin
authors.initials: Z
authors.lastname: Liang
authors.affiliation: Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education , Beijing, 100044, China.|Institute of Optoelectronics Technology, Beijing Jiaotong University , Beijing, 100044, China.
authors.forename: Suling
authors.initials: S
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education , Beijing, 100044, China.|Institute of Optoelectronics Technology, Beijing Jiaotong University , Beijing, 100044, China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Xu
authors.affiliation: Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education , Beijing, 100044, China.|Institute of Optoelectronics Technology, Beijing Jiaotong University , Beijing, 100044, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Qiao
authors.affiliation: Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education , Beijing, 100044, China.|Institute of Optoelectronics Technology, Beijing Jiaotong University , Beijing, 100044, China.
authors.forename: Pengjie
authors.initials: P
authors.lastname: Song
authors.affiliation: Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education , Beijing, 100044, China.|Institute of Optoelectronics Technology, Beijing Jiaotong University , Beijing, 100044, China.
authors.forename: Di
authors.initials: D
authors.lastname: Gao
authors.affiliation: Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education , Beijing, 100044, China.|Institute of Optoelectronics Technology, Beijing Jiaotong University , Beijing, 100044, China.
authors.forename: Xurong
authors.initials: X
authors.lastname: Xu
keywords: CsPbBr3 perovskite; blue emission; lamellar structures; nanoplatelets; nanosheets; quantum dots; shape control