Luminescence properties of Eu2+-activated NaCaBeSi2O6F for white light-emitting diode applications. (April 2018)

• Record Type: Journal Article
• Authors: Maggay, Irish Valerie B.; Yeh, Kai-Yuan; Lei, Bingfu; Brik, Mikhail G.; Piasecki, Michal; Liu, Wei-Ren
• Is Part Of: Materials research bulletin. Volume 100(2018)
• Page Start: 26
• Page End: 31
• Publication Date: 2018-04
• Subjects: NaCaBeSi2O6F -- Photoluminescence -- Phosphor -- Solid state reaction -- Light emitting diodes; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2017.11.059
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: A novel blue-emitting garnet NaCaBeSi2 O6 F:Eu 2+ phosphor was synthesized. The broad NUV excitation band (300–400 nm) gives blue emission. The LED made with NaCaBeSi2 O6 F:Eu 2+ and green and red-emitting phosphors gives white-light emission. Abstract: A series of blue-emitting NaCaBeSi2 O6 F:Eu 2+ phosphors were obtained via a solid state reaction. NaCaBeSi2 O6 F:Eu 2+ exhibit a broad absorption from 250 to 450 nm when monitored at 467 nm and display a broad emission band from 400 to 600 nm when excited at 397 nm. The concentration quenching was obtained when the concentration of Eu 2+ was increased to 0.8 mol%. Energy transfer interactions between Eu 2+ in host is due to dipole-dipole mechanisms and the critical distance was calculated to be 31.96 Å. The results obtained in this study highly indicates that NaCaBeSi2 O6 F:Eu 2+ can be a potential blue-emitting phosphor for light quality improvement in white-LED applications.