Intense violet-blue-emitting Ba2AlB4O9Cl:Eu2+ phosphors for applications in fluorescent lamps and ultraviolet-light-emitting diodes

Te-Wen Kuo; Chien-Hao Huang; Teng-Ming Chen

doi:10.1364/AO.49.004202

Intense violet-blue-emitting ${Ba}_{2} Al B_{4} O_{9} Cl : {Eu}^{2 +}$ phosphors for applications in fluorescent lamps and ultraviolet-light-emitting diodes

Te-Wen Kuo, Chien-Hao Huang, and Teng-Ming Chen

Applied Optics
Vol. 49,
Issue 22,
pp. 4202-4206
(2010)
•https://doi.org/10.1364/AO.49.004202

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Te-Wen Kuo, Chien-Hao Huang, and Teng-Ming Chen, "Intense violet-blue-emitting Ba₂AlB₄O₉Cl:Eu²⁺ phosphors for applications in fluorescent lamps and ultraviolet-light-emitting diodes," Appl. Opt. 49, 4202-4206 (2010)

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Table of Contents Category
- Materials
Optics & Photonics Topics
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The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Fluorescent and luminescent materials (160.2540)
- Rare-earth-doped materials (160.5690)
- Light-emitting diodes (230.3670)

About this Article
History
- Original Manuscript: March 11, 2010
- Revised Manuscript: April 29, 2010
- Manuscript Accepted: June 29, 2010
- Published: July 27, 2010

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Abstract

We synthesized a violet-blue phosphor ${Ba}_{2} Al B_{4} O_{9} Cl : {Eu}^{2 +}$ with a solid-state reaction. The excitation and emission spectra of this phosphor showed that all were broadband due to $4 f^{7} - 4 f^{6} d^{1}$ transitions of ${Eu}^{2 +}$ . The phosphors with different ${Eu}^{2 +}$ concentrations presented violet-blue luminescence for ultraviolet [(UV) $250 - 390 nm$ ] excitation. The optimum concentration of ${Eu}^{2 +}$ in ${Ba}_{2} Al B_{4} O_{9} Cl : {Eu}^{2 +}$ is determined to be $6 mol . %$ . The luminous efficiency was found to be $8.1 lm / W$ for the violet-blue fluorescent lamp and $3.2 lm / W$ for the violet-blue phosphor-converted light-emitting diode, respectively. ${Ba}_{2} Al B_{4} O_{9} Cl : {Eu}^{2 +}$ would be a promising phosphor for converting the UV radiation to violet-blue emission for a novel high light-conversion efficiency phototherapy illuminator.

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