Publications

Air-stable surface-passivated perovskite quantum dots for ultra-robust, single- and two-photon-induced amplified spontaneous emission

Air-stable surface-passivated perovskite quantum dots for ultra-robust, single- and two-photon-induced amplified spontaneous emission
Jun Pan, Smritakshi P. Sarmah, Banavoth Murali, Ibrahim Dursun, Wei Peng, Manas R Parida, Jiakai Liu, Lutfan Sinatra, Noktan Alyami, Chao Zhao, Erkki Alarousu, Tien Khee Khee Ng, Boon S. Ooi, Osman M. Bakr, and Omar F. Mohammed
J. Phys. Chem. Lett., 6(24), pp 5027-5033, (2015)
Jun Pan, Smritakshi P. Sarmah, Banavoth Murali, Ibrahim Dursun, Wei Peng, Manas R Parida, Jiakai Liu, Lutfan Sinatra, Noktan Alyami, Chao Zhao, Erkki Alarousu, Tien Khee Khee Ng, Boon S. Ooi, Osman M. Bakr, and Omar F. Mohammed
Quantum dots
2015
We demonstrate ultra-air- and photostable CsPbBr3 QDs by using an inorganic-organic hybrid ion pair as the capping ligand. This passivation approach to perovskite QDs yields high photoluminescence quantum yield with unprecedented operational stability in ambient conditions (60 ± 5% lab humidity) and high pump fluences, thus overcoming one of the greatest challenges impeding the development of perovskite-based applications. Due to the robustness of passivated perovskite QDs, we were able to induce ultra-stable amplified spontaneous emission (ASE) in solution processed QD films not only through one photon but also through two-photon absorption processes. The latter has not been observed before in the family of perovskite materials. More importantly, passivated perovskite QD films showed remarkable photostability under continuous pulsed laser excitation in ambient conditions for at least 34 hours (corresponds to 1.2 × 108 laser shots), substantially exceeding the stability of other colloidal QD systems in which ASE has been observed.
 
 
 
DOI: 10.1021/acs.jpclett.5b02460