Room temperature synthesis of Tb3+-activated BiF3 green-emitting nanoparticles with high thermal stability for near-ultraviolet white light-emitting didoes

Lin, Dongdong; Du, Peng

doi:10.1007/s00339-020-04225-7

Cited by 3 publications

(2 citation statements)

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“…Figure 3 shows the luminescence spectra of KYC: x Tb 3+ . From the excitation spectra presented in Figure 3 a, the whole excitation spectrum of Tb 3+ was mainly composed of 4f 8 –4f 7 5d 1 transition in the range of 200–300 nm and 4f 8 –4f 8 transition in the range of 300–390 nm [ 3 , 18 , 19 ]. In the f–d transition, there were mainly two strong excitation peaks at 245 and 283 nm, corresponding to the transition from the 7 F 6 ground state to 7 D J and 9 D J levels [ 9 ], respectively.…”

Section: Resultsmentioning

confidence: 99%

Quantum Cutting in Ultraviolet B-Excited KY(CO3)2:Tb3+ Phosphors

Zhu

2022

Materials

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Highly efficient quantum cutting KY(CO3)2:Tb3+ 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(CO3)2:Tb3+ remained in the Tb3+ 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(CO3)2:0.7Tb3+ could reach 119%. However, the most efficient quantum cutting occurred at the 5K8 excited state in the cross-relaxation of 5K8 + 7F65D4 + 5D4. The Tb3+ content could be selected arbitrarily in the KY(CO3)2 host without any concentration quenching. Optimal quantum cutting concentrations of Tb3+ in KY(CO3)2 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.

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Section: Resultsmentioning

confidence: 99%

Quantum Cutting in Ultraviolet B-Excited KY(CO3)2:Tb3+ Phosphors

Zhu

2022

Materials

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“…10,12 The first is doping single rare-earth ions into certain hosts, such as narrow-band emitting BiF 3 :Tb 3+ , CaIn 2 O 4 :Eu 3+ and Ca 9 NaZn (PO 4 ) 7 :Dy 3+ , or broadband emitting Ba 3 Lu 4 O 9 :Ce 3+ and (Rb, K) 2 CaPO 4 F:Eu 2+ . [13][14][15][16][17] Nevertheless, the f-f forbidden transitions of Tb 3+ , Eu 3+ and Dy 3+ make the quantum efficiency of the former too low to meet the requirements of WLED applications, for example, the internal quantum efficiencies of CaIn 2 O 4 :Eu 3+ , Ca 9 NaZn(PO 4 ) 7 :Dy 3+ and BiF 3 :Tb 3+ are 10%, 19.2% and 3.44%, respectively. Although the quantum efficiency of the phosphors adopting f-d allowed transitions is significantly increased, the application of such phosphors in high-quality WLED devices is still restricted by the imbalance of emission spectra.…”

Section: Introductionmentioning

confidence: 99%