Abstract
A series of LiLaSiO4:yTm3+, zEu3+ phosphors were prepared by high-temperature solid-phase reaction. The microstructure, luminescence performance and quantum yield of the phosphors are characterized by XRD, SEM and fluorescence spectrometer. When the monitoring wavelength is 360 nm, LiLaSiO4:yTm3+ phosphors showed a sharp emission peak at 460 nm, corresponding to the 7F0 → 5D2 energy level transition, and the concentration quenching point of Tm3+ ions was y = 0.015. LiLaSiO4:yTm3+, zEu3+ phosphors have emission peaks of Tm3+ ions at 460 nm and Eu3+ ions at 618 nm, respectively. As the molar mass fraction of Eu3+ ions doped increase, the luminous intensity of Tm3+ ions gradually decrease, and the luminous intensity of Eu3+ ions increase first and then decrease, and the concentration quenching point of Eu3+ ions was z = 0.08. The energy transfers of Tm3+ → Eu3+ ions through electric dipole-electric dipole interactions are demonstrated by the luminous intensity variation law and fluorescence lifetime. By changing the doping ratio of Eu3+ and Tb3+ ions, the full-color control of the phosphor luminescent color from blue to red can be achieved.
Highlights
The rapid development of solid-state lighting has made revolutionary progress in the field of lighting, providing a solid foundation for the global economy and energy security
It can be seen from the figure that the diffraction peak of the sample when doped with Tm3+ and Eu3+ ions matches well with the standard card of LiLaSiO4 (JCPDS No.48-0006)
It can be seen from the figure that the molar mass fraction of Eu3+ ions doping has a greater impact on the luminous intensity of the phosphors
Summary
The rapid development of solid-state lighting has made revolutionary progress in the field of lighting, providing a solid foundation for the global economy and energy security. The market generally uses yellow phosphor YAG:Ce3+ to coat blue light-emitting LED chips to produce white light[3] This method is simple and quick, it has disadvantages such as easy aging, low color rendering index and high color temperature[4]. Because of its special 4f energy level structure, it can exhibit different electronic transition forms and rich energy level transition modes, so it can absorb or emit light of various wavelengths from ultraviolet to infrared[10]. It is known as “a treasure house of luminescent materials”, widely used in modern lighting, display, testing and biomedical diagnosis and other fields[11]. After the sample is naturally cooled, it will be fully ground into fine powder for characterization test
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