Perovskite Light-Emitting Diodes with Improved Outcoupling Using a High-Index Contrast Nanoarray

Sohee Jeon, Lianfeng Zhao, Young Jin Jung, Ji Whan Kim, Sei Yong Kim, Hyeokjung Kang, Jun Ho Jeong, Barry P. Rand, Jeong Hwan Lee

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Organic–inorganic hybrid perovskite light-emitting diodes (PeLEDs) are promising for next-generation optoelectronic devices due to their potential to achieve high color purity, efficiency, and brightness. Although the external quantum efficiency (EQE) of PeLEDs has recently surpassed 20%, various strategies are being pursued to increase EQE further and reduce the EQE gap compared to other LED technologies. A key point to further boost EQE of PeLEDs is linked to the high refractive index of the perovskite emissive layer, leading to optical losses of more than 70% of emitted photons. Here, it is demonstrated that a randomly distributed nanohole array with high-index contrast can effectively enhance outcoupling efficiency in PeLEDs. Based on a comprehensive optical analysis on the perovskite thin film and outcoupling structure, it is confirmed that the nanohole array effectively distributes light into the substrate for improved outcoupling, allowing for 1.64 times higher light extraction. As a result, highly efficient red/near-infrared PeLEDs with a peak EQE of 14.6% are demonstrated.

Original languageEnglish (US)
Article number1900135
JournalSmall
Volume15
Issue number8
DOIs
StatePublished - Feb 22 2019

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

Keywords

  • high-index contrast
  • nanoarrays
  • outcoupling
  • perovskite light-emitting diodes

Fingerprint Dive into the research topics of 'Perovskite Light-Emitting Diodes with Improved Outcoupling Using a High-Index Contrast Nanoarray'. Together they form a unique fingerprint.

Cite this