Enhanced emission from Li2CaSiO4:Eu2+ phosphors by doping with Y3+

Zhong, Jianming; Zhao, Wenzhu; Lan, Licai; Wang, Jianqing; Chen, Junhua; Wang, Nenghuo

doi:10.1016/j.jallcom.2014.01.011

Cited by 25 publications

(10 citation statements)

References 37 publications

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“…As demonstrated in Fig. S3a, both the broad absorption band originating from the Eu 2+ ions and a sharp peaks centered at 395 nm ( 7 F 0 → 5 L 6 ) arising from the Eu 3+ ions were observed in the diffuse reflectance spectrum 21,25 , which further verified the coexistence of Eu 3+ and Eu 2+ ions in the resultant products. Furthermore, it has been confirmed that the relation between the absorption constant (i.e., α) and energy band gap (i.e., E g ) keeps to the following function 26,27 : where hv refers to the energy, A is related to the coefficient, while the value of n can be 1/2, 2, 3/2 and 3 which corresponds to direct, indirect, forbidden direct, and forbidden indirect electronic transitions, respectively.…”

Section: Resultssupporting

confidence: 54%

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Facile modulation the sensitivity of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors through adjusting spatial mode and doping concentration

Zhou

2020

Sci Rep

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Series of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors were prepared by solid-state reaction technique. All the samples emitted the unique emissions of Eu2+ and Eu3+ ions when excited by 395 nm, while the strongest emission intensity was received when x = 0.03. On the basis of theoretical discussion, it is evident that crossover relaxation should be responsible for the thermal quenching mechanism which was further proved by the unchanged lifetime at elevated temperature. Besides, through analyzing the inconsistent responses of the emission intensities of the Eu2+ and Eu3+ ions to the temperature, the optical thermometric properties of the designed phosphors were studied. By selecting different emissions of Eu3+ ions and combining with that of the Eu2+ ions, adjustable sensitivities were realized in the resultant phosphors. Furthermore, the sensitivities of the studied compound were also found to be greatly affected by the doping concentration. The maximum absolute and relative sensitivities of the synthesized compounds were 0.0025 K−1 and 0.289% K−1, respectively. These achieved results implied that the Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors were promising candidates for optical thermometry. Additionally, this work also provided promising methods to modulate the sensitivities of the luminescent compounds by adjusting spatial mode and doping concentration.

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Section: Resultssupporting

confidence: 54%

“…Scientific Reports | (2020) 10:20180 | https://doi.org/10.1038/s41598-020-77185-w www.nature.com/scientificreports/ was able to be fitted through utilizing a second-order exponential decay mode, which may be assigned to the nonradiative energy transfer process involving Eu 2+ ions and defects 21 , as described below:…”

Section: Resultsmentioning

confidence: 99%

Facile modulation the sensitivity of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors through adjusting spatial mode and doping concentration

Zhou

2020

Sci Rep

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“…[ 1 ] White light‐emitting diodes (LEDs) have been widely used in the fields of display and lighting because of their high luminous efficiency, long service life, and low energy consumption. [ 2 ] Traditional panchromatic phosphors are prepared by adjusting the ratio of red, blue, and green colours. The amount of each colour can be easily adjusted and a wide range of colour temperatures can be easily obtained.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, many researchers have developed single component phosphors. [ 2 ] Rare earth elements have many unique physical and chemical properties because they contain f electrons. In the past decade, phosphors doped with rare earth ions, such as phosphate, molybdate, and aluminate, have been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Preparation and luminescence properties of KLaSiO₄:Tb³⁺ phosphors

Wang

2022

Luminescence

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KLaSiO 4 :Tb 3+ phosphors were synthesized using the sol-gel method. The structure and luminescence properties of the materials were characterized using X-ray diffraction, Fourier transform infrared (FTIR) spectroscopy, thermogravimetry-differential thermal analysis, fluorescence spectra and calculated Commission Internationale de l'éclairage coordinates. The results showed that the material had a hexagonal structure, and that doping of Tb 3+ did not change the crystal structure of KLaSiO 4 . FTIR spectroscopy confirmed the existence of stretching vibrations of Si-O, bending vibrations of Si-O-Si, and asymmetric tensile vibrations of Si-O in KLaSiO 4 . The excitation spectrum of the sample consisted of 4f 7 !5d 1 broadband absorption and the characteristic excitation peak of Tb 3+ , the excitation peak at 232 nm belongs to the spin allowed 7 F J ! 7 D J transition of Tb 3+ , the excitation peak at 268 nm belongs to the spin forbidden 7 F J ! 9 D J transition of Tb 3+ , and the absorption band of 7 F J ! 7 D J transition is split. Under excitation at 232 nm, the emission peak of the sample was composed of the 5 D 4 ! 7 F J (J = 6, 5, 4, 3) energy level transition of Tb 3+ . The highest emission peak is located at 543 nm, which belongs to the 5 D 4 ! 7 F 5 transition and emits green light. Concentration quenching occurred when the Tb 3+ doping concentration was greater than 1% mol, the quenching mechanism was an electric dipoleelectric dipole action. When the ratio of citric acid to total metal ions was 1:1 and the annealing temperature was 800 C, the surface defects of the phosphors were greatly reduced, the quenching effect was reduced, and the luminous intensity reached the maximum.

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“…Examples of charge compensators being used for luminescence improvement include: K + charge compensator in Sr 3 WO 6 :Eu 3+ ,K + facilitated Eu 3+ doping and increased electron transition probability at 5 D 0 -7 F 2 in Eu 3+[15]; Ce 3+ and Na + co-doping and substituting Pr 3+ ,In 3+ suppressed the density of the quenching center and enhanced Pr 3+ emission[17]; and Y 3+ doping in Li 2 CaSiO 4 :Eu 2+ prohibited the intrinsic Li vacancy from oxidizing Eu 2+ to Eu 3+ by compensating for the negative charge of the Li vacancy instead of Eu 3+[18].In the literature, energy transfer mechanisms of the phosphate phosphors have been reported. Nevertheless, the influence of charge compensators and sensitizers on the luminescence of phosphate phosphors has not been investigated in-depth.…”

mentioning

confidence: 99%

XPS analysis and luminescence mechanism of white SrZn2(PO4)2:Eu2+,Mn2+ phosphor with In3+ sensitizer

Yang

Lin

Tung

et al. 2016

Journal of Alloys and Compounds

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Enhanced emission from Li2CaSiO4:Eu2+ phosphors by doping with Y3+

Cited by 25 publications

References 37 publications

Facile modulation the sensitivity of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors through adjusting spatial mode and doping concentration

Facile modulation the sensitivity of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors through adjusting spatial mode and doping concentration

Preparation and luminescence properties of KLaSiO₄:Tb³⁺ phosphors

XPS analysis and luminescence mechanism of white SrZn2(PO4)2:Eu2+,Mn2+ phosphor with In3+ sensitizer

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Enhanced emission from Li2CaSiO4:Eu2+ phosphors by doping with Y3+

Cited by 25 publications

References 37 publications

Facile modulation the sensitivity of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors through adjusting spatial mode and doping concentration

Facile modulation the sensitivity of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors through adjusting spatial mode and doping concentration

Preparation and luminescence properties of KLaSiO4:Tb3+ phosphors

XPS analysis and luminescence mechanism of white SrZn2(PO4)2:Eu2+,Mn2+ phosphor with In3+ sensitizer

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Preparation and luminescence properties of KLaSiO₄:Tb³⁺ phosphors