We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
In Situ Embedding Synthesis of Highly Stable CsPbBr<sub>3</sub>/CsPb<sub>2</sub>Br<sub>5</sub>@PbBr(OH) Nano/Microspheres through Water Assisted Strategy.
- Authors
Du, Kaimin; He, Lingjun; Song, Shuyan; Feng, Jing; Li, Yao; Zhang, Manli; Li, Huwei; Li, Chengyu; Zhang, Hongjie
- Abstract
The disappointing stability of perovskites, especially in water, remains a key issue hindering their further commercialization. Here, CsPbBr3/CsPb2Br5@PbBr(OH) (PQDs@PbBr(OH)) nano/microspheres with superior stability and outstanding photoluminescence quantum yield (PLQY, ≈98%) are fabricated through a water‐assisted process. The nano/microspheres can maintain excellent photoluminescence (PL) intensity and high PLQY (≈90%) when immersed in water for more than 18 months. By changing the water content in the reaction mixture, the phase, particle size, and PL peaks of the nano/microspheres will change. Compared with CsPbBr3/Cs4PbBr6 nanocrystals synthesized without water, PQDs@PbBr(OH) nano/microspheres exhibit better thermal stability, photostability, and superior stability in water. Based on the first‐principles calculations, the enhanced stability results from PbBr(OH) with high decomposition enthalpy in water, which can effectively prevent water from contacting PQDs embedded in it. Moreover, white light‐emitting diodes are fabricated by mixing green‐emitting PQDs@PbBr(OH) powder and K2SiF6:Mn4+ (KSF) red phosphor on a 460 nm blue chip and the device shows a high luminous efficacy of 101.27 lm W−1 at 10 mA. This work not only provides a reliable method for the facile preparation of ultrastable perovskites, but also has great potentials for future practical applications.
- Subjects
PHOSPHORS; MICROSPHERES; LIGHT emitting diodes; PHOSPHORESCENCE; THERMAL stability; SOLAR cells; PHOTOLUMINESCENCE
- Publication
Advanced Functional Materials, 2021, Vol 31, Issue 36, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202103275