Abstract

An excitation-energy-dependent luminescence phenomenon is reported in cesium lead bromide (${\rm CsPbBr}_3$) perovskite nanosheets. At 10 K, the relative integrated luminescence intensity between the trapped exciton (TX) emission and the free exciton (FX) emission shows an interesting tendency with increasing the optical excitation energy from 2.431 eV (510 nm) to 3.758 eV (330 nm). To interpret such phenomenon, we develop a quantitative model on the basis of the biological population growth theory. A good agreement between experiment and theory is obtained. It is thus revealed that the lower capture coefficient of the TX level to the excited excitons via multiphonon emission relative to the FX level shall be the major cause of the observed phenomenon. These findings may help to deepen the current understanding of the complex luminescence mechanisms of these emerging light-emitting materials.

© 2020 Optical Society of America

Full Article  |  PDF Article
More Like This
Enhancement of the optical properties of CsPbBr3 perovskite nanocrystals using three different solvents

Tae Wook Kang, Sol Lee, Young Ji Park, Gyu Jin Jeong, Jong Su Kim, Byungseo Bae, Jonghee Hwang, and Sun Woog Kim
Opt. Lett. 45(18) 4972-4975 (2020)

Temperature-dependent excitonic photoluminescence excited by two-photon absorption in perovskite CsPbBr3 quantum dots

Ke Wei, Zhongjie Xu, Runze Chen, Xin Zheng, Xiangai Cheng, and Tian Jiang
Opt. Lett. 41(16) 3821-3824 (2016)

Investigation on binding energy and reduced effective mass of exciton in organic–inorganic hybrid lead perovskite films by a pure optical method

Yang Liu, Ju Wang, Ning Zhu, Wei Liu, Cuncun Wu, Congyue Liu, Lixin Xiao, Zhijian Chen, and Shufeng Wang
Opt. Lett. 44(14) 3474-3477 (2019)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (12)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics