Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11008819 | Current Applied Physics | 2018 | 18 Pages |
Abstract
In this paper, we investigated the electronic structures and defect states of SrLaMgTaO6 (SLMTO) double perovskite structures by using resonant inelastic x-ray scattering. Recently, Eu3+ doped SLMTO red phosphors have been vigorously investigated due to their higher red emission efficiency compared to commercial white light emitting diodes (W-LED). However, a comprehensive understanding on the electronic structures and defect states of host SLMTO compounds, which are specifically related to the W-LED and photoluminescence (PL), is far from complete. Here, we found that the PL spectra of SLMTO powder compounds sintered at a higher temperature, 1400â¯Â°C, were weaker in the blue emission regions (at around 400â¯nm) and became enhanced in near infrared (NIR) regions compared to those sintered at 1200â¯Â°C. To elucidate the difference of the PL spectra, we performed resonant inelastic x-ray spectroscopy (RIXS) at Ta L-edge. Our RIXS result implies that the microscopic origin of different PL spectra is not relevant to the Ta-related defects and oxygen vacancies.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Ju Hyun Oh, Jung Ho Kim, Jung Hyun Jeong, Seo Hyoung Chang,