Quantum Cutting in Ultraviolet B-Excited KY(CO<sub>3</sub>)<sub>2</sub>:Tb<sup>3+</sup> Phosphors
oleh: Dechuan Li, Guangping Zhu
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2022-09-01 |
Deskripsi
Highly efficient quantum cutting KY(CO<sub>3</sub>)<sub>2</sub>:Tb<sup>3+</sup> phosphors excited by ultraviolet B (UVB) and ultraviolet C (UVC) were investigated. The structural and spectroscopic properties were characterized by XRD analysis and fluorescence spectrophotometry, respectively. The results showed that the monoclinic crystal structure of KY(CO<sub>3</sub>)<sub>2</sub>:Tb<sup>3+</sup> remained in the Tb<sup>3+</sup> doping range of 0~100%. In the excitation spectrum, two intense excitation peaks were observed in the ultraviolet range. Under the excitation of 283 nm, the maximum quantum efficiency of KY(CO<sub>3</sub>)<sub>2</sub>:0.7Tb<sup>3+</sup> could reach 119%. However, the most efficient quantum cutting occurred at the <sup>5</sup>K<sub>8</sub> excited state in the cross-relaxation of <sup>5</sup>K<sub>8</sub> + <sup>7</sup>F<sub>6</sub><sup>5</sup>D<sub>4</sub> + <sup>5</sup>D<sub>4</sub>. The Tb<sup>3+</sup> content could be selected arbitrarily in the KY(CO<sub>3</sub>)<sub>2</sub> host without any concentration quenching. Optimal quantum cutting concentrations of Tb<sup>3+</sup> in KY(CO<sub>3</sub>)<sub>2</sub> were 0.7 and 0.3 for the excitation of UVB and UVC, respectively. UVB-excited phosphors are more popular with high transparency in products such as glass or resin. A quick response code was fabricated by resin to show the hidden information clearly. Therefore, the highly efficient phosphor could be a candidate material for the application in information identification technology.