Tailoring of Deep-Red Luminescence in Ca2SiO4:Eu2

We report a new dicalcium silicate phosphor, Ca2−xEuxSiO4, which emits red light in response to blue‐light excitation. When excited at 450 nm, deep‐red emission at 650 nm was clearly observed in Ca1.2Eu0.8SiO4, the external and internal quantum efficiencies of which were 44 % and 50 %, respectively....

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2014-07, Vol.53 (30), p.7756-7759
Main Authors: Sato, Yasushi, Kato, Hideki, Kobayashi, Makoto, Masaki, Takaki, Yoon, Dae-Ho, Kakihana, Masato
Format: Article
Language:English
Subjects:
crystal-site engineering
Diodes
lanthanides
luminescence
phosphors
silicates
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Summary:We report a new dicalcium silicate phosphor, Ca2−xEuxSiO4, which emits red light in response to blue‐light excitation. When excited at 450 nm, deep‐red emission at 650 nm was clearly observed in Ca1.2Eu0.8SiO4, the external and internal quantum efficiencies of which were 44 % and 50 %, respectively. The red emission from Ca2−xEuxSiO4 was strongly related to the peculiar coordination environments of Eu2+ in two types of Ca sites. The red‐emitting Ca2SiO4:Eu2+ phosphors are promising materials for next‐generation, white‐light‐emitting diode applications. A dicalcium silicate phosphor, Ca2−xEuxSiO4, emits red light in response to blue‐light excitation. When excited at 450 nm, deep‐red emission at 650 nm was clearly observed in Ca1.2Eu0.8SiO4. The picture shows a photograph of the corresponding Ca1.20Eu0.80SiO4 phosphor upon excitation with blue LEDs. The external and internal quantum efficiencies were 44 % and 50 %, respectively.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201402520