Narrow-Band Emitting Phosphor Na2Cs2Sr(B9O15)2:Eu2+ Discovered from Local Structure Similarity with Sulfate Phosphor

Shota Takemura; Yukinori Koyama; Takayuki Nakanishi; Shiro Funahashi; Naoto Hirosaki; Hidekazu Ikeno; Takashi Takeda

doi:10.1021/acs.jpclett.2c02889

Narrow-Band Emitting Phosphor Na₂Cs₂Sr(B₉O₁₅)₂:Eu²⁺ Discovered from Local Structure Similarity with Sulfate Phosphor

J Phys Chem Lett. 2022 Dec 29;13(51):11878-11882. doi: 10.1021/acs.jpclett.2c02889. Epub 2022 Dec 15.

Authors

Shota Takemura¹, Yukinori Koyama², Takayuki Nakanishi³, Shiro Funahashi³, Naoto Hirosaki³, Hidekazu Ikeno⁴, Takashi Takeda³

Affiliations

¹ Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1330, Japan.
² Research and Services Division of Materials Data and Integrated System, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.
³ Luminescent Materials Group, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.
⁴ Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University, Sakai, Osaka 599-8570, Japan.

PMID: 36520951
DOI: 10.1021/acs.jpclett.2c02889

Abstract

Narrow-band emitting phosphors are required to improve the performance of phosphor-converted light-emitting diodes. Here, we found a new narrow-band emitting phosphor Na₂Cs₂Sr(B₉O₁₅)₂:Eu²⁺ using the local structure similarity with a known narrow-band emitting phosphor. In a 2D scatter plot of the structural similarity between the local structures, the Sr site in Na₂Cs₂Sr(B₉O₁₅)₂ was located near the Ba site of the known narrow-band emitting sulfate phosphor BaSO₄:Eu²⁺ with a distorted local structure. We synthesized Na₂Cs₂Sr(B₉O₁₅)₂:Eu²⁺ and characterized the luminescence properties by microspectroscopy. Na₂Cs₂Sr(B₉O₁₅)₂:Eu²⁺ showed a violet luminescence peaked at 417 nm, and the full-width at half-maximum was as narrow as 26 nm (1497 cm^-1).