Designing multi-mode optical thermometers via the thermochromic LaNbO4:Bi3+/Ln3+ (Ln = Eu, Tb, Dy, Sm) phosphors

Color tunable luminescence and optical temperature sensing performance in a single-phased KBaGd(WO4)3:Dy3+, Eu3+ phosphor

The series of β-Ca3(PO4)2-type phosphors Ca9.5-1.5xMgEux(PO4)7 were synthesized by a solid-state route. Observation of the proper Eu3+ ion distribution in the Ca9.5Mg(PO4)7 host matrix was made by a direct method using 151Eu Mossbauer spectroscopy in combination with X-ray analysis and dielectric and luminescent spectroscopy. The photoluminescence properties were studied in detail. The samples exhibit an exceptionally narrow-band red emission according to the dominant 5D0 → 7F2 transition and fulfill the industrial requirements for high-energy-efficiency red phosphors. The contribution of Eu3+ ions in different crystal sites to the luminescent properties is discussed in detail. The difference of the excitation of Eu3+ in the M1 and M2 sites was revealed by photoluminescence excitation spectra in accordance with structure refinement. The temperature dependence of the luminescence intensity was studied. Different tendencies in the thermal behavior of emission lines allow one to consider the studied compounds as phosphors suitable for luminescence thermometry. The measured quantum yield for Ca9.5-1.5xMgEux(PO4)7 shows excellent results and reaches 63%.

Role of the Eu3+ Distribution on the Properties of β-Ca3(PO4)2 Phosphors: Structural, Luminescent, and 151Eu Mössbauer Spectroscopy Study of Ca9.5-1.5xMgEux(PO4)7.

Dual-emitting from Bi3+/Eu3+ co-activated akermanite phosphor for optical thermometric applications

Dual emitting from Bi3+/Eu3+ co-activated Sr3La2Ge3O12 phosphor for optical thermometry

Insight into energy transfer, color tuning, and white emission in Tm3+ and Dy3+ codoped Ca8ZnLa(PO4)7 phosphors

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Insight into energy transfer, color tuning, and white emission in Tm3+ and Dy3+ codoped Ca8ZnLa(PO4)7 phosphors