摘要
α-CsPbI_(3)nanocrystals(NCs)with poor stability prevent their wide applications in optoelectronic fields.Ca^(2+)(1.00Å)as a new B-site doping ion can successfully boost CsPbI_(3)NC performance with both improved phase stability and optoelectronic properties.With a Ca^(2+)/Pb^(2+)ratio of 0.40%,both phase and photoluminescence(PL)stability could be greatly enhanced.Facilitated by increased tolerance factor,the cubic phase of its solid film could be maintained after 58 days in ambient condition or 4 h accelerated aging process at 120℃.The PL stability of its solution could be preserved to 83%after 147 days in ambient condition.Even using UV light to accelerate aging,the T50 of PL could boost 1.8-folds as compared to CsPbI_(3)NCs.Because Ca^(2+)doping can dramatically decrease defect densities of films and reduce hole injection barriers,the red light-emitting diodes(LEDs)exhibited about triple enhancement for maximum the external quantum efficiency(EQE)up to 7.8%and 2.2 times enhancement for half-lifetime of LED up to 85 min.We believe it is promising to further explore high-quality CsPbI_(3)NC LEDs via a Ca^(2+)-doping strategy.
出处
《Research》
SCIE
EI
CAS
CSCD
2021年第1期1192-1202,共11页
研究（英文）
基金
supported by the National Major Fundamen-tal Research Program of China(Grant No.91833306)
the National Natural Science Foundation of China(Grant Nos.62074083,62005131,and 61705111)
the Natural Science Foundation of Jiangsu Province(Grant No.BM2012010)
the Natural Science Fund for Colleges and Universities in Jiangsu Province(Grant No.20KJA510005)
the Priority Academic Program Development of Jiangsu Higher Educa-tion Institutions(Grant No.YX030003)
NUPTSF(Grant Nos.NY219158 and NY220025)
the Postgraduate Research&Practice Innovation Program of Jiangsu Prov-ince(KYCX20_0754).
