4.8 Article

Lattice strain modulation toward efficient blue perovskite light-emitting diodes

期刊

SCIENCE ADVANCES
卷 8, 期 38, 页码 -

出版社

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abq0138

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资金

  1. Natural Science Foundation of Guangdong Province, China [2020A1515010792, 2020B1515120022]
  2. National Key R&D Program of China [2019YFB2204500]
  3. Science and Technology Program of Shenzhen [SGDX20201103095607022, JCYJ20210324095003011, SGDX20190918105001787]
  4. Shenzhen Science and Technology Innovation Commission [KQTD20180412181422399, JCYJ20180507181858539]
  5. National Natural Science Foundation of China [62174079]
  6. Innovation and Technology Fund [GHP/013/19SZ]
  7. Guangdong-Hong Kong-Macao Joint Laboratory [2019B121205001]

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This study proposes a strategy to enhance the radiative emission efficiency using a strained system, which contributes to the development of efficient PeLEDs.
The successful implementation of perovskite light-emitting diodes (PeLEDs) in advanced displays and lighting has proven to be challenging because of the inferior performance of blue devices. Here, we point out that a strained system would lead to the quasi-degenerate energy state to enhance the excited-state transition due to the formation of double-polarized transition channel. The tensile strained structure also brings about a synergetic control of the carrier dynamics in virtue of lattice structure deformation and reduced dimensional phase regulation to promote carrier population in large bandgap domains and to realize near-unit energy transfer from the large bandgap phases to the emitter phases. Accordingly, high external quantum efficiencies of 14.71 and 10.11% are achieved for the 488- and 483-nanometer PeLEDs. This work represents a versatile strategy using a strained system to achieve enhanced radiative emission for the development of efficient PeLEDs.

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