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This content will become publicly available on March 28, 2019

Title: Doping Y 2O 3 with Mn 4+ for energy-efficient lighting

Developing energy-efficient LEDs that emit warm white light requires new red phosphors with appropriate emission wavelengths and band widths. Mn 4+-activated Y 2O 3 is a potential red LED phosphor with narrow emission and improved emission wavelength compared to previously known Mn 4+-activated oxide phosphors. Here in this work, the dopability and the oxidation state of Mn in Y 2O 3 are investigated based on the formation energies of native defects, Mn dopants, and divalent co-dopants (i.e., Ca, Sr, Cd, and Zn) calculated using hybrid density functional theory. We found that Mn 4+ is difficult to form in Y 2O 3 without co-doping. Stabilizing Mn 4+ on Y 3+ sites (forming Mn + Y donors) requires the co-doping of compensating acceptors (Ca or Sr) in oxygen-rich growth environments.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Beihang Univ., Beijing (United States). Dept. of Physics, Key Laboratory of Micro-Nano Measurement-Manipulation and Physics
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry C
Additional Journal Information:
Journal Volume: 6; Journal Issue: 15; Journal ID: ISSN 2050-7526
Publisher:
Royal Society of Chemistry
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
OSTI Identifier:
1435233
Alternate Identifier(s):
OSTI ID: 1434162