Internal quantum efficiency of radiation in a bulk CH3NH3PbBr3 perovskite crystal quantified by using the omnidirectional photoluminescence spectroscopy

K. Kojima, K. Ikemura, K. Matsumori, Y. Yamada, Y. Kanemitsu, S. F. Chichibu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The internal quantum efficiency (IQE) of radiation for bulk CH3NH3PbBr3 crystals was quantified by using omnidirectional photoluminescence spectroscopy. The angle-resolved photoluminescence revealed that the emission with photon energies higher than the absorption-edge shows a Lambertian distribution and that the light extraction efficiency is determined by the escaping cone. The IQE value strongly depends on the photo-excitation density (P), and a CH3NH3PbBr3 crystal fabricated under the methylammonium-rich conditions gave the maximum IQE of 62.5% under P = 28 W/cm2. A further increase in P gave rise to the decrease in IQE due to the Auger effects.

Original languageEnglish
Article number071116
JournalAPL Materials
Volume7
Issue number7
DOIs
Publication statusPublished - 2019 Jul 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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