Luminescence properties of Eu2+-activated NaCaBeSi2O6F for white light-emitting diode applications

• Published in: Materials research bulletin Vol. 100; pp. 26 - 31
• Main Authors: Maggay, Irish Valerie B., Yeh, Kai-Yuan, Lei, Bingfu, Brik, Mikhail G., Piasecki, Michal, Liu, Wei-Ren
• Format: Journal Article
• Language: English
• Published: United States Elsevier Ltd 01-04-2018
• Subjects: CONCENTRATION RATIO; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIPOLES; ENERGY TRANSFER; EUROPIUM IONS; EXCITATION; GARNETS; LIGHT EMITTING DIODES; LUMINESCENCE; NaCaBeSi2O6F; NEAR ULTRAVIOLET RADIATION; Phosphor; PHOSPHORS; Photoluminescence; QUENCHING; Solid state reaction; SOLIDS; Light emitting diodes; NaCaBeSi2O6F; Solid state reaction; Phosphor; Photoluminescence
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2017.11.059

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•A novel blue-emitting garnet NaCaBeSi2O6F:Eu2+ phosphor was synthesized.•The broad NUV excitation band (300–400nm) gives blue emission.•The LED made with NaCaBeSi2O6F:Eu2+ and green and red-emitting phosphors gives white-light emission.
A series of blue-emitting NaCaBeSi2O6F:Eu2+ phosphors were obtained via a solid state reaction. NaCaBeSi2O6F:Eu2+ exhibit a broad absorption from 250 to 450nm when monitored at 467nm and display a broad emission band from 400 to 600nm when excited at 397nm. The concentration quenching was obtained when the concentration of Eu2+ was increased to 0.8mol%. Energy transfer interactions between Eu2+ in host is due to dipole-dipole mechanisms and the critical distance was calculated to be 31.96Å. The results obtained in this study highly indicates that NaCaBeSi2O6F:Eu2+ can be a potential blue-emitting phosphor for light quality improvement in white-LED applications.