Synthesis and luminescent properties of a white light phosphor KBa{sub 2}Nb{sub 5}O{sub 15}:Na{sup +}, Dy{sup 3+} for light-emitting-devices
Graphical abstract: - Highlights: • A novel red phosphor KBa{sub 2}Nb{sub 5}O{sub 15}:Dy{sup 3+} was synthesized and investigated firstly. • Crystal structure and characteristic luminescence properties are discussed. • The charge compensation mechanism is also investigated. • It has low color tolerance and better CIE chromaticity coordinates. - Abstract: The white light emission phosphor KBa{sub 2}Nb{sub 5}O{sub 15}:Dy{sup 3+} was synthesized by solid-state method. X-ray diffraction (XRD) study reveals that all the Dy{sup 3+} doped phosphors are single phase. Strong excitation peaks of KBa{sub 2}Nb{sub 5}O{sub 15}:Dy{sup 3+} were found around 380–400 nm, matched well with the NUV LED chip. Under 388 nm excitation, the phosphor exhibited intense white emission by combining the two emission peaks at 477 nm and 572 nm, attributed to the characteristic {sup 4}F{sub 9/2}–{sup 6}H{sub 15/2} and {sup 4}F{sub 9/2}–{sup 6}H{sub 13/2} transition of Dy{sup 3+}. The optimum doping concentration of Dy{sup 3+} is found to be 3%, whose Commission International de l’ Eclairage (CIE) chromaticity coordinates and correlated color temperature are (0.395, 0.422) and 3925 K, respectively. The results indicate that the KBa{sub 2}Nb{sub 5}O{sub 15}:Dy{sup 3+} phosphor could be considered as a potential candidate for white-LEDs.
- OSTI ID:
- 22341811
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 9 Vol. 48; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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