CsPbxMn1-xCl3Perovskite Quantum Dots with High Mn Substitution Ratio.
CsPbX3(X = Cl, Br, I) perovskite quantum dots (QDs) are potential emitting materials for illumination and display applications, but toxic Pb is not environment- and user-friendly. In this work, we demonstrate the partial replacement of Pb with Mn through phosphine-free hot-injection preparation of CsPbxMn1-xCl3QDs in colloidal solution. The Mn substitution ratio is up to 46%, and the as-prepared QDs maintain the tetragonal crystalline structure of the CsPbCl3host. Meaningfully, Mn substitution greatly enhances the photoluminescence quantum yields of CsPbCl3from 5 to 54%. The enhanced emission is attributed to the energy transfer of photoinduced excitons from the CsPbCl3host to the doped Mn, which facilitates exciton recombination via a radiative pathway. The intensity and position of this Mn-related emission are also tunable by altering the experimental parameters, such as reaction temperature and the Pb-to-Mn feed ratio. A light-emitting diode (LED) prototype is further fabricated by employing the as-prepared CsPbxMn1-xCl3QDs as color conversion materials on a commercially available 365 nm GaN LED chip.
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China.
Huiwen
H
Liu
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China.
Zhennan
Z
Wu
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China.
Jieren
J
Shao
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China.
Dong
D
Yao
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China.
Hang
H
Gao
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China.
Yi
0000-0003-0548-6073
Y
Liu
The China-US Joint Laboratory, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science , Changchun, 130033, People's Republic of China.
Weili
W
Yu
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China.
Hao
0000-0002-2373-1100
H
Zhang
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China.
Bai
0000-0002-3873-075X
B
Yang
CsPbxMn1−xCl3; light-emitting diode; low lead; perovskite quantum dots; phosphine-free preparation