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Highly Luminescent and Ultrastable CsPbBr 3 Perovskite Quantum Dots Incorporated into a Silica/Alumina Monolith
Author(s) -
Li Zhichun,
Kong Long,
Huang Shouqiang,
Li Liang
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201703264
Subject(s) - monolith , materials science , quantum dot , luminescence , photoluminescence , full width at half maximum , chemical engineering , phosphor , perovskite (structure) , light emitting diode , catalysis , optoelectronics , chemistry , organic chemistry , engineering
We successfully prepared QDs incorporated into a silica/alumina monolith (QDs‐SAM) by a simple sol–gel reaction of an Al–Si single precursor with CsPbBr 3 QDs blended in toluene solution, without adding water and catalyst. The resultant transparent monolith exhibits high photoluminescence quantum yields (PLQY) up to 90 %, and good photostability under strong illumination of blue light for 300 h. We show that the preliminary ligand exchange of didodecyl dimethyl ammonium bromide (DDAB) was very important to protect CsPbBr 3 QDs from surface damages during the sol–gel reaction, which not only allowed us to maintain the original optical properties of CsPbBr 3 QDs but also prevented the aggregation of QDs and made the monolith transparent. The CsPbBr 3 QDs‐SAM in powder form was easily mixed into the resins and applied as color‐converting layer with curing on blue light‐emitting diodes (LED). The material showed a high luminous efficacy of 80 lm W −1 and a narrow emission with a full width at half maximum (FWHM) of 25 nm.