Minimizing Optical Energy Losses for Long‐Lifetime Perovskite Light‐Emitting Diodes

Regardless of the rapid advance on perovskite light‐emitting diodes (PeLEDs), the lack of long‐term operational stability hinders the practicality of this technology. Particularly, thermal management is indispensable to control the Joule heating induced by charge transport and parasitic re‐absorptio...

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Bibliographic Details
Published in:Advanced functional materials 2021-11, Vol.31 (46), p.n/a
Main Authors: Ye, Yong‐Chun, Li, Yan‐Qing, Cai, Xiao‐Yi, Zhou, Wei, Shen, Yang, Shen, Kong‐Chao, Wang, Jing‐Kun, Gao, Xingyu, Zhidkov, Ivan S., Tang, Jian‐Xin
Format: Article
Language:English
Subjects:
Charge transport
Computer architecture
Emitters
Joule heating
Light emitting diodes
long‐term stability
Materials science
Ohmic dissipation
perovskite light‐emitting diodes
Perovskites
Quantum efficiency
red emission
Resistance heating
Thermal management
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Summary:Regardless of the rapid advance on perovskite light‐emitting diodes (PeLEDs), the lack of long‐term operational stability hinders the practicality of this technology. Particularly, thermal management is indispensable to control the Joule heating induced by charge transport and parasitic re‐absorption of internally confined photons. Herein, a synergetic device architecture is proposed for minimizing the optical energy losses in PeLEDs toward high efficiency and long lifetime. By adopting a carefully modified perovskite emitter in combination with an improved light outcoupling structure, red PeLEDs emitting at 666 nm achieve a peak external quantum efficiency of 21.2% and an operational half‐lifetime of 4806.7 h for an initial luminance of 100 cd m‐2. The enhanced light extraction from trapped modes can efficiently reduce the driving current and suppress optical energy losses in PeLEDs, which in turn ameliorate the heat‐induced device degradation during operation. This work paves the way toward high‐performance PeLEDs for display and lighting applications in the future. A synergetic device architecture is proposed for minimizing Joule heating in perovskite light‐emitting diodes toward high efficiency and long lifetime. By reducing the driving current and suppressing light re‐absorption in the perovskite emitter, the red‐emission device achieves a peak external quantum efficiency of 21.2% and an operational half‐lifetime of 4806.7 h.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202105813