Photoluminescence properties of the entire excitonic series in Cu2 O

Mitsuyoshi Takahata, Nobuko Naka

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We investigated the photoluminescence spectra of Cu2O under photoexcitation at 3.05 eV across the violet band gap. The following three features were found: photoluminescence from blue and violet excitons; photoluminescence from yellow excitons of s,d, and f states in addition to p states with a quantum number up to ten; and emissions associated with the inelastic collision of the 1s yellow excitons. The first process is relevant for the separation of radiative and nonradiative decay rates. The second process likely indicates radiative enhancement of high Rydberg yellow excitons. The last process verifies up-conversion of 1s yellow paraexcitons into higher Rydberg states, which is a critical factor impeding the realization of a high-density paraexciton gas towards transition to the Bose-Einstein condensation.

Original languageEnglish
Article number195205
JournalPhysical Review B
Volume98
Issue number19
DOIs
Publication statusPublished - 2018 Nov 21
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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