Journal
JOURNAL OF LUMINESCENCE
Volume 236, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2021.118086
Keywords
CsPbBr3 quantum dots; Photoluminescence; Damage free encapsulation; Stability
Categories
Funding
- National Natural Science Foundation of China [61274140, 11674053]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010432]
- Young Talents in Higher Education of Guangdong [2017KQNCX129]
- City University of Hong Kong Strategic Research Grant (SRG) [7005505]
- Program of Hanshan Normal University [XN201918]
- Special Funds for the Cultivation of Guangdong College Students' Scientific and Technological Innovation (Climbing Program Special Funds) [pdjh2020b0378]
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The study demonstrates a damage-free plasma-based encapsulation technique with real-time in situ diagnosis for protecting CsPbBr3 QDs films from photoluminescence degradation, maintaining their intrinsic PL efficiency, and enhancing long-term stability under harsh conditions after encapsulation with a-SiCx:H.
Although encapsulation is an effective technique to improve the stability of perovskite quantum dots (PQDs), they are prone to photoluminescence (PL) degradation during encapsulation. Herein, a damage-free plasma-based encapsulation technique in combination with real-time in situ diagnosis is designed for CsPbBr3 QDs films. The CH4/SiH4 plasma has little destructive effects on the CsPbBr3 QDs. The a-SiCx:H films prepared with the CH4/SiH4 plasma by low-temperature plasma-enhanced chemical vapor deposition protect the CsPbBr3 QDs from surface damage during encapsulation, so that the intrinsic PL efficiency is maintained. Furthermore, the PL intensity is improved by increasing the carbon concentration in a-SiCx:H and the CsPbBr3 QDs films encapsulated by a-SiCx:H show long term stability under harsh conditions such as prolonged air exposure, UV light illumination for more than 60 days, immersion in water, as well as thermal treatment at 205 degrees C.
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