A novel double perovskite La2ZnTiO6:Eu3+ red phosphor for solid-state lighting: Synthesis and optimum luminescence

[Display omitted] •Red-emitting phosphors La2ZnTiO6:Eu3+ were synthesized for the first time.•The samples can be efficiently excited by near-UV/blue light and emit red light.•Chromaticity coordinate (0.66, 0.34) is very close to standard red color coordinates.•Red-emitting LED is constructed with UV...

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Bibliographic Details
Published in:Optics and laser technology 2017-11, Vol.96, p.43-49
Main Authors: Fu, Anjie, Guan, Anxiang, Gao, Fangfang, Zhang, Xiaoshan, Zhou, Liya, Meng, Yingbin, Pan, Haiman
Format: Article
Language:English
Subjects:
Chromaticity
Crystallization
Diffraction
Dipole interactions
Dipoles
Europium
Excitation spectra
High temperature
Indium gallium nitrides
Light emitting diodes
Luminescence properties
Perovskite
Phosphors
Photoluminescence
Rare earths
Red phosphor
Solid state
Thermal stability
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Summary:[Display omitted] •Red-emitting phosphors La2ZnTiO6:Eu3+ were synthesized for the first time.•The samples can be efficiently excited by near-UV/blue light and emit red light.•Chromaticity coordinate (0.66, 0.34) is very close to standard red color coordinates.•Red-emitting LED is constructed with UV chip validating the good availability. A novel red-emitting phosphor (La2ZnTiO6:Eu3+) was synthesized using a high-temperature solid-state method. Phase purity was examined by X-ray diffraction analysis. Results showed that the obtained La2ZnTiO6:Eu3+ phosphors crystallized in the monoclinic space group P121/n1(14). The photoluminescence spectrum under the excitation of 394nm revealed two narrow bands at 594 and 616nm, which correspond to the 5D0–7F1 and 5D0–7F2 transitions of Eu3+, respectively. The energy transfer mechanism among Eu3+ ions was identified as dipole–dipole interactions. The phosphor exhibited ideal chromaticity coordinate (0.66, 0.34), which is close to the standard red color coordinates (0.67, 0.33). The temperature-dependent PL spectra were analyzed, and the calculated activation energy Ea indicated the good thermal stability of the phosphor. The red-emitting light-emitting diodes (LED) fabricated by LZT:Eu3+ and 395nm-emitting InGaN chip exhibited high brightness intensity. Hence, La2ZnTiO6:Eu3+ can be potentially applied to LEDs.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2017.04.025