Abstract

All-inorganic cubic $\alpha {-} {{\rm CsPbI}_3}$ perovskite for red perovskite light-emitting device (PeLED) applications is suffering from a phase transition. Unstable black $\alpha$ phase tends to transit to yellow $\delta$ phase under ambient conditions, which results in poor performance of the ${{\rm CsPbI}_3}$-based PeLEDs. Partial replacement of iodine anion with a comparatively smaller bromine anion in the perovskite film can effectively adjust the Goldschmidt tolerance factor and stabilize the $\alpha$-phase. A phase-stable ${\rm CsPb}{({{\rm Br}_{1 - x}}{{\rm I}_x})_3}$ perovskite has been obtained at low annealing temperature of 50°C by tuning the iodine-to-bromine ratios. A PeLED with pure red emission based on the ${\rm CsPb}{({{\rm Br}_{0.43}}{{\rm I}_{0.57}})_3}$ perovskite has been demonstrated. The maximum luminance and efficiency were ${2200}\;{{\rm cd/m}^2}$ and 0.38 cd/A, respectively. Moreover, the PTAA layer was introduced between the PEDOT:PSS and perovskite film to improve the surface morphologies of perovskite. As a result, red PeLEDs with a maximum luminance of ${2765}\;{{\rm cd/m}^2}$ have been achieved.

© 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)

Enhanced efficiency of all-inorganic perovskite light-emitting diodes by using F4-TCNQ-doped PTAA as a hole-transport layer

Yu-Shan Liu, Shuang Guo, Jing Feng, Yue-Feng Liu, Yan-Gang Bi, Da Yin, Xu-Lin Zhang, and Hong-Bo Sun
Opt. Lett. 44(19) 4817-4820 (2019)

Improved light extraction in all-inorganic perovskite light-emitting devices with periodic nanostructures by nanoimprinting lithography

Shuang Guo, Yu-Shan Liu, Xu-Lin Zhang, Yue-Feng Liu, Yan-Gang Bi, Xue-Mei Wen, Jing Feng, and Hong-Bo Sun
Opt. Lett. 45(18) 5156-5159 (2020)

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 OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA 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 OSA member, or as an authorized user of your institution.

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

Figures (6)

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

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

Metrics

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

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