Dual-functional application of Ca2Ta2O7:Bi3+/Eu3+ phosphors in multicolor tunable optical thermometry and WLED

• Published in: Frontiers of Optoelectronics (Online) Vol. 17; no. 1; pp. 31 - 17
• Main Authors: Ru, Jingjing, Zhao, Bing, Zeng, Fan, Guo, Feiyun, Liu, Jinhua, Chen, Jianzhong
• Format: Journal Article
• Language: English
• Published: Beijing Higher Education Press 04-09-2024; Springer Nature B.V; Springer & Higher Education Press
• Subjects: Acid resistance; Biomedical Engineering and Bioengineering; Clean energy; Color; Electrical Engineering; Emission; Energy transfer; Engineering; Europium; High temperature; Light emitting diodes; Optical thermometry; Phosphor; Phosphors; Physics; Quenching; Research Article; Stability; Thermal resistance; Thermochromism; Thermometers; Thermometry; White light; WLEDs; Zero-thermal-quenching; Zero-thermal-quenching; Optical thermometry; WLEDs; Energy transfer; Phosphor
• ISSN: 2095-2767; 2095-2759; 2095-2767
• DOI: 10.1007/s12200-024-00134-2

A series of Bi
3+
/Eu
3+
co-doped Ca
2
Ta
2
O
7
(CTO:Bi
3+
/Eu
3+
) phosphors were prepared by high-temperature solid-state method for dual-emission center optical thermometers and white light-emitting diode (WLED) device. By modulating the doping ratio of Bi
3+
/Eu
3+
and utilizing the energy transfer from Bi
3+
to Eu
3+
, the tunable color emission ranging from green to reddish-orange was realized. The designed CTO:0.04Bi
3+
/Eu
3+
optical thermometers exhibit significant thermochromism, superior stability, and repeatability, with maximum sensitivities of
S
a
= 0.055 K
−1
(at 510 K) and
S
r
= 1.298% K
−1
(at 480 K) within the temperature range of 300−510 K, owing to the different thermal quenching behaviors between Bi
3+
and Eu
3+
ions. These features indicate the potential application prospects of the prepared samples in visualized thermometer or high-temperature safety marking. Furthermore, leveraging the excellent zero-thermal-quenching performance, outstanding acid/alkali resistance, and color stability of CTO:0.04Bi
3+
/0.16Eu
3+
phosphor, a WLED device with a high
R
a
value of 95.3 has been realized through its combination with commercially available blue and green phosphors, thereby demonstrating the potential application of CTO:0.04Bi
3+
/0.16Eu
3+
in near-UV pumped WLED devices.
Graphical abstract