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Improved performance of pure red perovskite light-emitting devices based on CsPb(Br1-xIx)3 with variable content of iodine and bromine

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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

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