Open AccessFirst Synthesis of Mn-Doped Cesium Lead Bromide Perovskite Magic Sized Clusters at Room Temperature
Author(s) -
Ke Xu,
Evan T. Vickers,
Binbin Luo,
A’Lester C. Allen,
Eefei Chen,
Graham Roseman,
Qihui Wang,
David S. Kliger,
Glenn L. Millhauser,
Wenjing Yang,
Xueming Li,
Jin Z. Zhang
Publication year - 2020
Publication title -
the journal of physical chemistry letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.563
H-Index - 203
ISSN - 1948-7185
DOI - 10.1021/acs.jpclett.9b03700
Subject(s) - photoluminescence , materials science , dopant , perovskite (structure) , passivation , doping , analytical chemistry (journal) , optoelectronics , nanotechnology , chemistry , crystallography , layer (electronics) , chromatography
Mn-doped CsPbBr 3 perovskite magic sized clusters (PMSCs) are synthesized for the first time using benzoic acid and benzylamine as passivating ligands and MnCl 2 ·4H 2 O and MnBr 2 as the Mn 2+ dopant sources at room temperature. The same approach is used to prepare Mn-doped CsPbBr 3 perovskite quantum dots (PQDs). The concentration of MnX 2 (X = Cl or Br) affects the excitonic absorption of the PMSCs and PQDs. A higher concentration of MnX 2 favors PMSCs over PQDs as well as higher photoluminescence (PL) quantum yields (QYs) and PL stability. The large ratio between the characteristic Mn emission (∼590 nm) and the host band-edge emission shows efficient energy transfer from the host exciton to the Mn 2+ dopant. PL excitation, electron paramagnetic resonance, and time-resolved PL results all support Mn 2+ doping in CsPbBr 3 , which likely replaces Pb 2+ ions. This study establishes a new method for synthesizing Mn-doped PMSCs with good PL stability, high PLQY and highly effective passivation.