Suzuka Noda, Yasushi Sato, Takuya Hasegawa, Masato Kakihana, Shu Yin
{"title":"Relationship between Bandgap Energy and Photoluminescence Properties of Pr3+-activated Complex Perovskite Oxide by Cation–Nitrogen Substitution","authors":"Suzuka Noda, Yasushi Sato, Takuya Hasegawa, Masato Kakihana, Shu Yin","doi":"10.1039/d3nj05682a","DOIUrl":null,"url":null,"abstract":"The photoluminescence properties of <em>f</em>–<em>f</em> emission-type phosphors are strongly dependent on the electronic structure of the host materials. This study investigated in detail the relationship between the bandgap energy and the photoluminescence properties of Pr<small><sup>3+</sup></small>. CaTa<small><sub>2/3</sub></small>Mg<small><sub>1/3</sub></small>O<small><sub>3</sub></small>–CaTaO<small><sub>2</sub></small>N solid solutions, Ca<small><sub>3</sub></small>Ta<small><sub>3-x</sub></small>Mg<small><sub>x</sub></small>O<small><sub>6+3x</sub></small>N<small><sub>3-3x</sub></small> (0.00 ≦ x ≦ 1.00), were chosen as the host material for the approach used herein. The bandgap energy level (<em>E<small><sub>g</sub></small></em>) for the Ca<small><sub>3</sub></small>Ta<small><sub>3-x</sub></small>Mg<small><sub>x</sub></small>O<small><sub>6+3x</sub></small>N<small><sub>3-3x</sub></small> solid solutions was systematically changed from 2.7 to 5.1 eV by controlling the Mg/Ta and O/N ratios. The photoluminescence excitation and emission controls were systematically performed by engineering <em>E<small><sub>g</sub></small></em> for the samples. In the excitation spectra, the maximum photoluminescence excitation wavelength shifted to a shorter wavelength according to the <em>E<small><sub>g</sub></small></em> expansion. In the emission spectra, the red emission assigned to the <small><sup>1</sup></small>D<small><sub>2</sub></small>–<small><sup>3</sup></small>H<small><sub>4</sub></small> levels of Pr<small><sup>3+</sup></small> in the samples with x = 0.25–0.50 could be excited at near-UV light regions (350 nm) when the <em>E<small><sub>g</sub></small></em> in the host materials was adjusted to approximately 3.0 eV. Conversely, several emissions, including a green emission belonging to the <small><sup>3</sup></small>P<small><sub>0</sub></small>–<small><sup>3</sup></small>H<small><sub>4</sub></small> levels of Pr<small><sup>3+</sup></small>, were observed when the <em>E<small><sub>g</sub></small></em> of the samples with x = 0.75–0.95 became larger than 3.0 eV. The results indicate that the photoluminescence properties of the <em>f</em>–<em>f</em> emission-type phosphors are attributed to the <em>E<small><sub>g</sub></small></em> in the host materials.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"New Journal of Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1039/d3nj05682a","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The photoluminescence properties of f–f emission-type phosphors are strongly dependent on the electronic structure of the host materials. This study investigated in detail the relationship between the bandgap energy and the photoluminescence properties of Pr3+. CaTa2/3Mg1/3O3–CaTaO2N solid solutions, Ca3Ta3-xMgxO6+3xN3-3x (0.00 ≦ x ≦ 1.00), were chosen as the host material for the approach used herein. The bandgap energy level (Eg) for the Ca3Ta3-xMgxO6+3xN3-3x solid solutions was systematically changed from 2.7 to 5.1 eV by controlling the Mg/Ta and O/N ratios. The photoluminescence excitation and emission controls were systematically performed by engineering Eg for the samples. In the excitation spectra, the maximum photoluminescence excitation wavelength shifted to a shorter wavelength according to the Eg expansion. In the emission spectra, the red emission assigned to the 1D2–3H4 levels of Pr3+ in the samples with x = 0.25–0.50 could be excited at near-UV light regions (350 nm) when the Eg in the host materials was adjusted to approximately 3.0 eV. Conversely, several emissions, including a green emission belonging to the 3P0–3H4 levels of Pr3+, were observed when the Eg of the samples with x = 0.75–0.95 became larger than 3.0 eV. The results indicate that the photoluminescence properties of the f–f emission-type phosphors are attributed to the Eg in the host materials.