Blue–Green Emitting Phosphor Ba 2 LiAlSi 2 O 8 :Eu 2 + for Phosphor-Converted Light-Emitting Diodes via Single-Particle Diagnosis in a Quasi-Quaternary System

Akihiro Nakanishi; Shiro Funahashi; Yukinori Koyama; Hisanori Yamane; Kohsei Takahashi; Takayuki Nakanishi; Naoto Hirosaki; Takashi Takeda

doi:10.1021/acsami.6c02416

Journal article Blue–Green Emitting Phosphor Ba ₂ LiAlSi ₂ O ₈ :Eu ^{2 +} for Phosphor-Converted Light-Emitting Diodes via Single-Particle Diagnosis in a Quasi-Quaternary System

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Akihiro Nakanishi, Shiro Funahashi, Yukinori Koyama, Hisanori Yamane, Kohsei Takahashi, Takayuki Nakanishi, Naoto Hirosaki, Takashi Takeda. Blue–Green Emitting Phosphor Ba ₂ LiAlSi ₂ O ₈ :Eu ^{2 +} for Phosphor-Converted Light-Emitting Diodes via Single-Particle Diagnosis in a Quasi-Quaternary System. ACS Applied Materials & Interfaces. 2026, 18 (20), 28857-28865. https://doi.org/10.1021/acsami.6c02416

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A new blue–green emitting Ba2LiAlSi2O8: Eu2+ phosphor was discovered from exploratory experiments in the BaO-Li2O-Al2O3-SiO2 quasi-quaternary system using a single-particle-diagnosis approach. Single-crystal X-ray diffraction analysis revealed that Ba1.96Eu0.04LiAlSi2O8 crystallizes in a space group of Pna21 (No. 33) with a = 8.04521(11) Å, b = 19.0484(2) Å, c = 5.02228(6) Å, and Z = 4. The crystal structure comprises LiO₄, AlO₄, and SiO₄ tetrahedra, which orderly align and form a framework by sharing apical oxygen atoms. Ba atoms are surrounded by eight and seven oxygen atoms in the framework. Density functional theory calculations corroborated the Al and Si arrangement in the Ba2LiAlSi2O8 crystal structure. A single-phase powder of the Ba2LiAlSi2O8: Eu2+ phosphor was successfully obtained via a solid-state reaction. This phosphor exhibited a blue–green luminescence peak at 497 nm with a full width at half maximum of 85 nm under 372 nm excitation. The internal and external quantum efficiencies were 51.0% and 42.7%, respectively. The peak intensity at 150°C was 67% of that at room temperature. We fabricated pc-LEDs based on 405 nm LED chips combined with Ba2LiAlSi2O8: Eu2+ phosphor, and the CIE chromaticity coordinates were in the blue–green region. These results indicate that the new Ba2LiAlSi2O8: Eu2+ phosphor is a promising candidate for future LED technologies.

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Creative Commons BY Attribution 4.0 International

Keyword: Eu2+-activated phosphor, single-crystal X-ray diffraction, quasi-quaternary system, new crystal phase, phosphor-converted LEDs

Date published: 2026-05-27

Publisher: National Institute for Materials Science

Journal:

ACS Applied Materials & Interfaces (ISSN: 19448252) vol. 18 issue. 20 p. 28857-28865

Funding:

Core Research for Evolutional Science and Technology JPMJCR19J2

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1021/acsami.6c02416

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Updated at: 2026-06-16 11:39:41 +0900

Published on MDR: 2026-06-16 14:26:18 +0900

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