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- Title
Quantum‐Confined Dodecahedron CsPbBr<sub>3</sub> Quantum Dots by A Sequential Post‐Treatment Strategy for Efficient Blue PeLEDs.
- Authors
Yuan, Longfei; Li, Dewang; Liu, Hongli; Zhang, Fei; Wang, Shirong
- Abstract
CsPbBr3 quantum dots (QDs) prepared through traditional hot‐injection and room temperature reprecipitation methods are usually hexahedral (nanoplate/cube) and green‐emitting. These methods severely obstruct the development of blue perovskite‐based light‐emitting diodes (PeLEDs) because the resultant QDs always suffer unachievable morphology regulation. Here, highly efficient blue‐emitting rhombic dodecahedron CsPbBr3 QDs (CsPbBr3 <12> QDs) are obtained by regulating morphological transformation for the first time through a novel and facile sequential post‐treatment strategy. Hydrobromide (‐NH3+) with stronger adsorption energy promotes the morphology transform of QDs from nanoplate to cube by substituting oleylamine in the first step. Then, polar solvent vapor eliminates PbX64− and led to the (112) crystal plane of the cube QDs being exposed, which is effectively stabilized by ‐NH3+ to realize morphology transition from cube to the dodecahedron. Highly efficient 12‐faceted dodecahedrons are endowed with significantly enhanced photoluminescence quantum yield of 89.8% at 476 nm as well as uniform size distribution and mono‐dispersity. The target blue PeLEDs achieve the maximum external quantum efficiency of 6.6% (480 nm) and excellent spectrum stability. This study provides a new strategy to prepare blue‐emitting CsPbBr3 <12> QDs by delicate control toward the growth and polyhedron process of crystal.
- Subjects
QUANTUM dots; LIGHT emitting diodes; QUANTUM efficiency; POLAR solvents; PRECIPITATION (Chemistry); CUBES
- Publication
Advanced Functional Materials, 2022, Vol 32, Issue 51, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202208065