In:
Optics Letters, Optica Publishing Group, Vol. 45, No. 10 ( 2020-05-15), p. 2724-
Abstract:
All-inorganic cubic α − C s P b I 3 perovskite for red perovskite light-emitting device (PeLED) applications is suffering from a phase transition. Unstable black α phase tends to transit to yellow δ phase under ambient conditions, which results in poor performance of the C s P b I 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 α -phase. A phase-stable C s P b ( B r 1 − x 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 C s P b ( B r 0.43 I 0.57 ) 3 perovskite has been demonstrated. The maximum luminance and efficiency were 2200 c d / 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 c d / m 2 have been achieved.
Type of Medium:
Online Resource
ISSN:
0146-9592
,
1539-4794
Language:
English
Publisher:
Optica Publishing Group
Publication Date:
2020
detail.hit.zdb_id:
243290-0
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