(Ba,Sr)Y2Si2Al2O2N5 : Eu2+: a novel near-ultraviolet converting green phosphor for white light-emitting diodes

A highly intense green-emitting phosphor BaY2Si2Al2O2N5 : Eu2+ (BYN : Eu2+) peaking at 511 nm was synthesized by a solid state reaction. The structure refinement, luminescence properties of BYN : Eu2+ phosphors as well as their thermal quenching and the fabrication of white-light-emitting diodes (W-...

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Bibliographic Details
Published in:Journal of materials chemistry 2011, Vol.21 (11), p.3740-3744
Main Authors: Liu, Wei-Ren, Yeh, Chiao-Wen, Huang, Chien-Hao, Lin, Chun Che, Chiu, Yi-Chen, Yeh, Yao-Tsung, Liu, Ru-Shi
Format: Article
Language:English
Subjects:
Color
Diodes
Emission
Luminescence
Phosphors
Quenching
Splitting
Strontium
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Summary:A highly intense green-emitting phosphor BaY2Si2Al2O2N5 : Eu2+ (BYN : Eu2+) peaking at 511 nm was synthesized by a solid state reaction. The structure refinement, luminescence properties of BYN : Eu2+ phosphors as well as their thermal quenching and the fabrication of white-light-emitting diodes (W-LEDs) were firstly investigated. By partially substituting Ba by Sr, namely (Ba,Sr)Y2Si2Al2O2N5 : Eu2+ (BSYN : Eu2+), the emission peak was shifted to 565 nm, giving a yellow-orange color, due to the splitting of the 5d energy level. By utilizing a mixture of blue-emitting BaMgAl10O17 : Eu2+, green-emitting BYN : Eu2+ and red-emitting CaAlSiN3 : Eu2+ phosphors as light converters, an intense white GaN-based n-UV-LED (380 nm) was fabricated to a exhibit good color-rendering index Ra of 84.5 at a correlated color temperature of 5089 K and CIE coordinates of (0.3425, 0.3478). Based on these results, we are currently evaluating the potential application of BYN : Eu2+ as a green-emitting near-UV convertible phosphor.
ISSN:0959-9428
1364-5501
DOI:10.1039/c0jm03573d