서로 다른 증착 온도에서 성장된 BaWO4:Sm3+ 형광체 박막의 구조, 광학, 표면 형상의 특성
Structural, optical, and morphological properties of BaWO4:Sm3+ phosphor thin films grown at different deposition temperature
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The effects of the growth temperature on the structural, optical, and morphological properties of BaWO4:Sm3+ phosphor thin films were investigated. The BaWO4:Sm3+ thin films were grown on quartz substrates at several growth temperatures by radio-frequency magnetron sputtering. All the thin films crystallized in a tetragonal structure with a main BaWO4 (112) diffraction peak. The 830 nm-thick BaWO4:Sm3+ thin films grown at 300 ℃ exhibited numerous polygon-shaped particles. The excitation spectra of BaWO4:Sm3+ thin films consisted of a broad excitation band in the 200–270 nm with a maximum at 236 nm due to the O2--Sm3+ charge transfer and two small bands peaked at 402 and 463 nm, respectively. Under 236 nm excitation, the BaWO4:Sm3+ thin films showed an intense red emission peak at 641 nm due to the 4G5/2→6H9/2 transition of Sm3+, indicating that the Sm3+ ions occupied sites of non-inversion symmetry in the BaWO4 host lattice. The highest emission intensity was observed for the thin film grown at 300 ℃, with a 51.8% transmittance and 5.09 eV bandgap. The average optical transmittance in the wavelength range of 500–1100 nm was increased from 53.2% at 200 ℃ to 60.8% after growing at 400 ℃. These results suggest that 300 ℃ is the optimum temperature for growing red-emitting BaWO4:Sm3+ thin films.
Abstract
The effects of the growth temperature on the structural, optical, and morphological properties of BaWO4:Sm3+ phosphor thin films were investigated. The BaWO4:Sm3+ thin films were grown on quartz substrates at several growth temperatures by radio-frequency magnetron sputtering. All the thin films crystallized in a tetragonal structure with a main BaWO4 (112) diffraction peak. The 830 nm-thick BaWO4:Sm3+ thin films grown at 300 ℃ exhibited numerous polygon-shaped particles. The excitation spectra of BaWO4:Sm3+ thin films consisted of a broad excitation band in the 200–270 nm with a maximum at 236 nm due to the O2--Sm3+ charge transfer and two small bands peaked at 402 and 463 nm, respectively. Under 236 nm excitation, the BaWO4:Sm3+ thin films showed an intense red emission peak at 641 nm due to the 4G5/2→6H9/2 transition of Sm3+, indicating that the Sm3+ ions occupied sites of non-inversion symmetry in the BaWO4 host lattice. The highest emission intensity was observed for the thin film grown at 300 ℃, with a 51.8% transmittance and 5.09 eV bandgap. The average optical transmittance in the wavelength range of 500–1100 nm was increased from 53.2% at 200 ℃ to 60.8% after growing at 400 ℃. These results suggest that 300 ℃ is the optimum temperature for growing red-emitting BaWO4:Sm3+ thin films.
참고문헌 (17)
- Zhi-wei Zhang, "A novel red-emitting phosphor Ca9Bi(PO4)7:Eu3+ for near ultraviolet white light-emitting diodes", Current Applied Physics, 15(3), pp.248~252 (2015), 한국물리학회
- P. Du, "Photoluminescence and cathodoluminescence properties of Eu3+ions activated AMoO4 (A=Mg, Ca, Sr, Ba)phosphors", Mater. Res. Bull, 70, pp.553~558 (2015)
- X. Wang, "Controlled synthesis and tunable luminescence of NaYF4:Eu3+", J. Rare Earth, 28, pp.222~224 (2010)
- A. Scarangella, "Visible emission from bismuth-doped yttrium oxide thin films for lighting and display Applications", Sci. Rep, 7, pp.17325~ (2017)
- A. Suresh Kumar, "Influence of calcination temperature on the luminescent properties of Eu3+ doped CaAl4O7 phosphor prepared by Pechini method", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 134, pp.283~287 (2015), Elsevier BV[DOI]
- R. Krishnan, "Depth profiling and photometric characteristics of Pr3+ doped BaMoO4 thin phosphor films grown using (266 nm Nd-YAG laser) pulsed laser deposition", Appl. Surf. Sci, 488, pp.783~790 (2019)
- M. L. Pang, "Luminescent properties of Gd2Ti2O7:Eu3+phosphor films prepared by Sol-gel process", Mater. Res. Bull, 39, pp.1607~1614 (2004)
- Shinho Cho, "Structural and Optical Properties of Sm-doped BaMoO4 Phosphor Thin Films Deposited by Radio-Frequency Magnetron Sputtering", Journal of the Korean Physical Society, 76(8), pp.745~749 (2020), 한국물리학회[DOI]
- A. O. Bokuniaeva, "Estimation of particle size using the debye equation and the schrrer formula for polyphasic TiO2 powder", J. Phys. Conf. Ser, 1410, pp.012057~ (2019)
- 강동균, "증착 온도가 Eu3+ 이온이 도핑된 MgMoO4 형광체 박막의 특성에 미치는 영향", 한국표면공학회지, 49(1), pp.81~86 (2016), 한국표면공학회[DOI]
- F. A. Mir, "Transparent wide band gap crystals follow indirect allowed transition and bipolaron hopping mechanism", Results Phys, 4, pp.103~104 (2014)
- A. Bouhdjer, "Correlation between the structural, morphological, optical, and electrical properties of In2O3 thin films obtained by an ultrasonic spray CVD process", J. Semicond, 36, pp.082002~ (2015)
- Y. Jin, "Luminescence properties of a novel orange emission long persistent phosphor CaO:Sm3+", Opt. Commun, 311, pp.266~269 (2013)
- X. Zhang, "Effects of Li+on photoluminescence of Sr3SiO5:Sm3+red phosphor,", Chin. Phys. B, 22, pp.097801~ (2013)
- J. Liao, "Hydrothermal preparation and luminescence property of MWO4:Sm3+(M=Ca, Sr, Ba) red phosphors", Optik, 123, pp.901~905 (2012)
- M. Puchalska, "The effect of charge compensation by means of Na+ ions on the luminescence behavior of Sm3+-doped CaAl4O7 phosphor", J. Lumin, 132, pp.826~831 (2012)
- Z. Yang, "Synthesis and luminescence properties of a novel red Sr3Bi(PO4)3:Sm3+ phosphor,", J. Rare Earth, 30, pp.1199~1202 (2012)