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A series of host-activated Tb3+ and Eu3+-co-doped CaNb2O6 (CNO) phosphors with tunable luminescence were synthesized via high-temperature solid-state method with the purpose of developing single-component phosphors for white light-emitting diode (LED) devices. Benefiting from blue broadband emission of CNO and multiple energy transfer of NbO43− → Tb3+ → Eu3+, white light-emitting CNO:Tb3+, Eu3+ phosphors were achieved by reasonably adjusting the doping content of Tb3+ and Eu3+ ions. Two typical white light-emitting phosphors, CNO:0.015Tb3+, 0.02Eu3+ with color coordinate (0.33, 0.33) and CNO:0.10Tb3+, 0.05Eu3+ with color coordinate (0.40, 0.39), could maintain 63% and 73% of the initial integral intensity at 150 °C and had good color stability. Subsequently, the representative CNO:0.015Tb3+, 0.02Eu3+ phosphors were successfully applied to a 275 nm ultraviolet chip to fabricate a white LED device with a low correlated color temperature of 3464 K and a high color rendering index of 86.0. The above results indicate that synthesized single-component white light-emitting CNO:Tb3+, Eu3+ phosphors have good application prospects in the field of white LED. Moreover, this strategy of using self-activated host and multiple energy transfer also provides guidance for the design of novel white light-emitting phosphors. [ABSTRACT FROM AUTHOR]

The remote and non-invasive optical thermometer exploiting fluorescence intensity ratio technology is of great importance in various intelligent optoelectronic sensors. Dual-emitting YNbO 4 :Bi3+, Eu3+ phosphor is synthesized and investigated for the development of temperature sensing materials. The phosphor excited at 318 nm shows a blue broad band emission and several red sharp peaks. The value of Bi3+→Eu3+ energy transfer can reach 98.2% when Eu3+ doping content is 0.14. Benefiting from diverse thermal response behaviors due to Bi3+ and Eu3+ ions completely different electronic configurations, a dual-emitting optical thermometer is designed. The maximum values of absolute and relative sensitivities are as high as 2.51% K−1 at 473 K and 1.43% K−1 at 423 K, respectively. The thermochromic phosphor possesses a great chromaticity shift (ΔE = 317×10−3) with temperature. Based on superior color discriminability, visual colorimetry temperature measurement relied on thermal characteristic is proposed. All the results demonstrate that YNbO 4 :0.01Bi3+, 0.005Eu3+ phosphor as a sensitive and reliable optical thermometer has great potentials in temperature measurement. [ABSTRACT FROM AUTHOR]

Researches on tunable luminescence and temperature sensitivity of phosphors have become an increasingly popular trend. This paper reports a series of Ca 2 YZr 2 Al 3 O 12 (CYZA):Bi3+, Sm3+ phosphors prepared by solid-state reaction. The phase purity, energy transfer, luminescent properties and temperature sensing performance of the phosphors have been carefully studied. CYZA:Bi3+, Sm3+ phosphors excited by ultraviolet light show tunable color emission, and the color shifts from dark blue to pink due to Bi3+→Sm3+ energy transfer. The related luminescent mechanism of phosphors is also explained. In addition, according to the different thermal sensitivity of Bi3+ and Sm3+, the temperature sensitivity of the phosphors is studied by fluorescence intensity ratio model. The maximum values of absolute sensitivity and relative sensitivity reach up to 0.099% K−1 at 423 K and 0.356% K−1 at 473 K, respectively. These findings indicate that CYZA:Bi3+, Sm3+ phosphors are potential candidates for tunable luminescence and temperature sensing. • The color-tunable property can be obtained in CYZA:Bi3+, Sm3+ phosphors. • Energy transfer from Bi3+ to Sm3+ ions. • Different thermal attenuation behaviors of Bi3+ and Sm3+ ions. • Temperature sensing performance is investigated by FIR model. [ABSTRACT FROM AUTHOR]