Efficient and tunable electroluminescence from in situ synthesized perovskite quantum dots
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Semiconductor quantum dots (QDs) are among the most promising next-generation optoelectronic materials. QDs are generally obtained through either epitaxial or colloidal growth and carry the promise for solution-processed high-performance optoelectronic devices such as light-emitting diodes (LEDs), solar cells, etc. Herein, a straightforward approach to synthesize perovskite QDs and demonstrate their applications in efficient LEDs is reported. The perovskite QDs with controllable crystal sizes and properties are in situ synthesized through one-step spin-coating from perovskite precursor solutions followed by thermal annealing. These perovskite QDs feature size-dependent quantum confinement effect (with readily tunable emissions) and radiative monomolecular recombination. Despite the substantial structural inhomogeneity, the in situ generated perovskite QDs films emit narrow-bandwidth emission and high color stability due to efficient energy transfer between nanostructures that sweeps away the unfavorable disorder effects. Based on these materials, efficient LEDs with external quantum efficiencies up to 11.0% are realized. This makes the technologically appealing in situ approach promising for further development of state-of-the-art LED systems and other optoelectronic devices.
Date Issued
2019-02-22
Date Acceptance
2019-01-14
Citation
Small, 2019, 15 (8)
ISSN
1613-6810
Publisher
Wiley
Journal / Book Title
Small
Volume
15
Issue
8
Copyright Statement
© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article: Yu, H., Wang, H., Zhang, J., Lu, J., Yuan, Z., Xu, W., Hultman, L., Bakulin, A. A., Friend, R. H., Wang, J., Liu, X.‐K., Gao, F., Small 2019, 15, 1804947., which has been published in final form at https://dx.doi.org/10.1002/smll.201804947
Sponsor
The Royal Society
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/30690874
Grant Number
UF130178
Subjects
energy transfer
light-emitting diodes
organic-inorganic hybrid perovskites
tunable emission
Publication Status
Published
Coverage Spatial
Germany
Article Number
1804947
Date Publish Online
2019-01-28