Luminescence properties of near-UV excitable yellow-orange light emitting warm CaSrAl_2SiO_7:Sm~(3+) phosphors
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摘要
Single-phase CaSrAl_2 SiO_7:Sm~(3+) phosphors were synthesized by traditional high temperature solid state reaction method. Formation of samples and phase analysis were confirmed by X-ray diffraction technique. Morphology was done by field emission scanning electron microscopy and elemental compositions were confirmed by energy dispersive X-ray analysis. Present phosphors have tetragonal crystallography with space group P42_1 m. Average crystallite size was calculated by using Scherrer and Williamson-Hall method. Photoluminescence study of CaSrAl_2 SiO_7:Sm~(3+) phosphor was investigated.Under different excitation wavelengths, PL spectra consist of four emission bands at 564, 570, 601 and650 nm. The emission bands located at 564 and 570 nm are associated with the transition ~4 G_(5/2)→~6 H_(5/2)while emission bands at 601 and 650 nm are due to ~4 G_(5/2)→~6 H_(7/2) and ~4 G_(5/2)→~6 H_(9/2),respectively.Intense emission was obtained when phosphor was excited under 404 nm wavelength. Non-radiative energy transfer process involved in concentration quenching, was also discussed. CIE coordinate is found in yellow-orange region, hence CaSrAl_2SiO_7:Sm~(3+) phosphors emit yellow-orange light when efficiently excited by near UV(～400 nm) LED chip. Color purity and CCT of the phosphor were determined; CCT suggests that present phosphor is a good candidate as a warm yellow-orange color emitting phosphor. Effect of different heating rates and different UV exposure time on the TL glow curve of the phosphor was investigated. Activation energies and kinetic parameters for different traps were calculated by using peak shape method. TL emission spectrum was also recorded. Present article explains all the possible mechanisms associated with luminescence process in CaSrAl_2 SiO_7:Sm~(3+) phosphors.
Single-phase CaSrAl_2 SiO_7:Sm~(3+) phosphors were synthesized by traditional high temperature solid state reaction method. Formation of samples and phase analysis were confirmed by X-ray diffraction technique. Morphology was done by field emission scanning electron microscopy and elemental compositions were confirmed by energy dispersive X-ray analysis. Present phosphors have tetragonal crystallography with space group P42_1 m. Average crystallite size was calculated by using Scherrer and Williamson-Hall method. Photoluminescence study of CaSrAl_2 SiO_7:Sm~(3+) phosphor was investigated.Under different excitation wavelengths, PL spectra consist of four emission bands at 564, 570, 601 and650 nm. The emission bands located at 564 and 570 nm are associated with the transition ~4 G_(5/2)→~6 H_(5/2)while emission bands at 601 and 650 nm are due to ~4 G_(5/2)→~6 H_(7/2) and ~4 G_(5/2)→~6 H_(9/2),respectively.Intense emission was obtained when phosphor was excited under 404 nm wavelength. Non-radiative energy transfer process involved in concentration quenching, was also discussed. CIE coordinate is found in yellow-orange region, hence CaSrAl_2SiO_7:Sm~(3+) phosphors emit yellow-orange light when efficiently excited by near UV(～400 nm) LED chip. Color purity and CCT of the phosphor were determined; CCT suggests that present phosphor is a good candidate as a warm yellow-orange color emitting phosphor. Effect of different heating rates and different UV exposure time on the TL glow curve of the phosphor was investigated. Activation energies and kinetic parameters for different traps were calculated by using peak shape method. TL emission spectrum was also recorded. Present article explains all the possible mechanisms associated with luminescence process in CaSrAl_2 SiO_7:Sm~(3+) phosphors.
Single-phase CaSrAl_2 SiO_7:Sm~(3+) phosphors were synthesized by traditional high temperature solid state reaction method. Formation of samples and phase analysis were confirmed by X-ray diffraction technique. Morphology was done by field emission scanning electron microscopy and elemental compositions were confirmed by energy dispersive X-ray analysis. Present phosphors have tetragonal crystallography with space group P42_1 m. Average crystallite size was calculated by using Scherrer and Williamson-Hall method. Photoluminescence study of CaSrAl_2 SiO_7:Sm~(3+) phosphor was investigated.Under different excitation wavelengths, PL spectra consist of four emission bands at 564, 570, 601 and650 nm. The emission bands located at 564 and 570 nm are associated with the transition ~4 G_(5/2)→~6 H_(5/2)while emission bands at 601 and 650 nm are due to ~4 G_(5/2)→~6 H_(7/2) and ~4 G_(5/2)→~6 H_(9/2),respectively.Intense emission was obtained when phosphor was excited under 404 nm wavelength. Non-radiative energy transfer process involved in concentration quenching, was also discussed. CIE coordinate is found in yellow-orange region, hence CaSrAl_2SiO_7:Sm~(3+) phosphors emit yellow-orange light when efficiently excited by near UV(～400 nm) LED chip. Color purity and CCT of the phosphor were determined; CCT suggests that present phosphor is a good candidate as a warm yellow-orange color emitting phosphor. Effect of different heating rates and different UV exposure time on the TL glow curve of the phosphor was investigated. Activation energies and kinetic parameters for different traps were calculated by using peak shape method. TL emission spectrum was also recorded. Present article explains all the possible mechanisms associated with luminescence process in CaSrAl_2 SiO_7:Sm~(3+) phosphors.
引文
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2. Guo H, Zhang H, Wei RF, Zheng MD, Zhang LH. Preparation, structural and luminescent properties of Ba_2Gd_2Si_4O_(13):Eu~(3+)for white LEDs. Optic Express.2011;19:A201.
3. Nair GB, Dhoble SJ. Orange light-emitting Ca_3Mg_3(PO_4)_4:Sm~(3+)phosphors.Luminescence. 2017;32:125.
4. Deng YM, Yi SP, Wang YH, Xian JQ. Synthesis and photoluminescence characteristics of Ln~(3+)(Ln=Sm, Er and Dy)-doped BaGd_2(MoO_4)_4 phosphors. Opt Mater. 2014;36:1378.
5. Antoinette MM, Israel S, Sathya G, Amali AJ, Berchmans JL, Sujatha K, et al.Experimental charge density distribution and its correlation to structural andoptical properties of Sm~(3+)doped Nd_2O_3nanophosphors. J Rare Earths.2017;35(11):1102.
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9. Miao SH, Xia ZG, Molokeev MS, Zhang J, Liu QL. Crystal structure refinement and luminescence properties of blue-green-emitting CaSrAl_2SiO_7:Ce~(3+),Li~+,Eu~(2+)phosphors. J Mater Chem C. 2015;3:8322.
10. Sharma S, Brahme N, Bisen DP, Dewangan P, Tigga S, Tiwari G, et al. Study on photoluminescence and thermoluminescence properties of UV-irradiated CaSrAl_2SiO_7:Ce~(3+)phosphors. J Mater Sci Mater Electron. 2018;29:1412.
11. Prabhu YT, Rao KV, Kumar VS, Kumari BS. X-ray analysis by williamson-hall and size-strain plot methods of ZnO nanoparticles with fuel variation.WJNSE. 2014;4:21.
12. Zak AK, Majid WHA, Abrishami ME, Yousefi R. X-ray analysis of ZnO nanoparticles by Williamson-Hall and size-strain plot methods. Solid State Sci.2011;13:251.
13. Yu R, Noh HM, Moon BK, Choi BC, Jeong JH, Lee HS, et al. Photoluminescence characteristics of Sm~(3+)doped Ba_3La(PO_4)_3 as new orange-red emitting phosphors.J Lumin. 2014;45:717.
14. Sun JF, Ding DB, Sun JY. Synthesis and photoluminescence properties of a novel reddish orange-emitting Sm~(3+)-doped strontium borosilicate phosphor. Opt Mater. 2016;58:188.
15. Lu GG, Qiu KH, Li JF, Zhang VVT, Yuan XQ. Synthesis and photoluminescence characteristics of Sm~(3+)-doped Bi_4Si_3O_(12)red-emitting phosphor. Luminescence.2017:32:93.
16. Okada G, Fujimoto Y, Tanaka H, Kasap S, Yanagida T. Sm-doped CsBr crystal as a new radio-photoluminescence(RPL)material. J Rare Earths. 2016;34(8):769.
17. Mondal K, Manam J. Optical properties of novel Sm~(3+)activated distrontium magnesium disilicate phosphor. J Mater Sci Mater Electron. 2017;28:8793.
18. Vishwakarma AK, Jayasimhadri M. Pure orange color emitting Sm~(3+)doped BaNb_2O_6 phosphor for solid-state lighting applications.J Lumin. 2016;176:112.
19. Du P, Bharat LK, Guan XY, Yu JS. Synthesis and luminescence properties of colortunable Dy~(3+)-activated CaWO_4 phosphors.J Appl Phys. 2015;117, 083112.
20. Shang MM, Li C, Lin J. How to produce white light in a single-phase host. Chem Soc Rev. 2014;43:1372.
21. Li JG, Yan HF, Yan FM. Synthesis and luminescence characterization of a new yellowish-orange phosphor:Ba_2B_(10)O_(17):Sm~(3+). Luminescence. 2017;32:30.
22. Vishwakarma AK, Jha K, Jayasimhadri M, Sivaiah B, Gahtori B, Haranath D.Emerging cool white light emission from Dy~(3+)doped single phase alkaline earth niobate phosphors for indoor lighting applications. Dalton Trans.2015;44:17166.
23. Mashangva M, Singh MN, Singh TB. Estimation of optimal trapping parameters relevant to persistent luminescence. Indian J Pure Appl Phys. 2011;49:583.
24. Daniel DJ,Annalakshmi O, Madhusoodanan U, Ramasamy P. Thermoluminescence characteristics and dosimetric aspects of fluoroperovskites(NaMgF_3:Eu~(2+),Ce~(3+)).J Rare Earths. 2014:32:496.
25. KaurN, Singh M, Singh L, Lochad SP.Investigation of thermoluminescence characteristics of gamma irradiated phlogopite mica. Radiat Phys Chem.2013;87:26.
26. Lei BF, YueS, Zhang YZ, Liu YL. Luminescence properties of Sr_2SnO_4:Sm~(3+)afterglow phosphor. Chin Phys Lett. 2010:27, 037201.
2. Guo H, Zhang H, Wei RF, Zheng MD, Zhang LH. Preparation, structural and luminescent properties of Ba_2Gd_2Si_4O_(13):Eu~(3+)for white LEDs. Optic Express.2011;19:A201.
3. Nair GB, Dhoble SJ. Orange light-emitting Ca_3Mg_3(PO_4)_4:Sm~(3+)phosphors.Luminescence. 2017;32:125.
4. Deng YM, Yi SP, Wang YH, Xian JQ. Synthesis and photoluminescence characteristics of Ln~(3+)(Ln=Sm, Er and Dy)-doped BaGd_2(MoO_4)_4 phosphors. Opt Mater. 2014;36:1378.
5. Antoinette MM, Israel S, Sathya G, Amali AJ, Berchmans JL, Sujatha K, et al.Experimental charge density distribution and its correlation to structural andoptical properties of Sm~(3+)doped Nd_2O_3nanophosphors. J Rare Earths.2017;35(11):1102.
6.Sharma K, Bahl S, Singh B, Kumar P, Lochab SP, Pandey A. BaSO_4:Eu as an energy independent thermoluminescent radiation dosimeter for gamma rays and C~(6+)ion beam. Radiat Phys Chem. 2018; 145:64.
7. Kawano N, Kawaguchi N, Okada G, Fujimoto Y, Yanagida T. Scintillation and dosimetric properties of Ce-doped strontium aluminoborate glasses. J NonCryst Solids. 2018;482:154.
8.Mesady IE, Khaled N, Hussein A, Samman HE, Alawsh S. Thermoluminescent properties of some phosphor glasses based on aluminium oxide. Luminescence.2016;31:1433.
9. Miao SH, Xia ZG, Molokeev MS, Zhang J, Liu QL. Crystal structure refinement and luminescence properties of blue-green-emitting CaSrAl_2SiO_7:Ce~(3+),Li~+,Eu~(2+)phosphors. J Mater Chem C. 2015;3:8322.
10. Sharma S, Brahme N, Bisen DP, Dewangan P, Tigga S, Tiwari G, et al. Study on photoluminescence and thermoluminescence properties of UV-irradiated CaSrAl_2SiO_7:Ce~(3+)phosphors. J Mater Sci Mater Electron. 2018;29:1412.
11. Prabhu YT, Rao KV, Kumar VS, Kumari BS. X-ray analysis by williamson-hall and size-strain plot methods of ZnO nanoparticles with fuel variation.WJNSE. 2014;4:21.
12. Zak AK, Majid WHA, Abrishami ME, Yousefi R. X-ray analysis of ZnO nanoparticles by Williamson-Hall and size-strain plot methods. Solid State Sci.2011;13:251.
13. Yu R, Noh HM, Moon BK, Choi BC, Jeong JH, Lee HS, et al. Photoluminescence characteristics of Sm~(3+)doped Ba_3La(PO_4)_3 as new orange-red emitting phosphors.J Lumin. 2014;45:717.
14. Sun JF, Ding DB, Sun JY. Synthesis and photoluminescence properties of a novel reddish orange-emitting Sm~(3+)-doped strontium borosilicate phosphor. Opt Mater. 2016;58:188.
15. Lu GG, Qiu KH, Li JF, Zhang VVT, Yuan XQ. Synthesis and photoluminescence characteristics of Sm~(3+)-doped Bi_4Si_3O_(12)red-emitting phosphor. Luminescence.2017:32:93.
16. Okada G, Fujimoto Y, Tanaka H, Kasap S, Yanagida T. Sm-doped CsBr crystal as a new radio-photoluminescence(RPL)material. J Rare Earths. 2016;34(8):769.
17. Mondal K, Manam J. Optical properties of novel Sm~(3+)activated distrontium magnesium disilicate phosphor. J Mater Sci Mater Electron. 2017;28:8793.
18. Vishwakarma AK, Jayasimhadri M. Pure orange color emitting Sm~(3+)doped BaNb_2O_6 phosphor for solid-state lighting applications.J Lumin. 2016;176:112.
19. Du P, Bharat LK, Guan XY, Yu JS. Synthesis and luminescence properties of colortunable Dy~(3+)-activated CaWO_4 phosphors.J Appl Phys. 2015;117, 083112.
20. Shang MM, Li C, Lin J. How to produce white light in a single-phase host. Chem Soc Rev. 2014;43:1372.
21. Li JG, Yan HF, Yan FM. Synthesis and luminescence characterization of a new yellowish-orange phosphor:Ba_2B_(10)O_(17):Sm~(3+). Luminescence. 2017;32:30.
22. Vishwakarma AK, Jha K, Jayasimhadri M, Sivaiah B, Gahtori B, Haranath D.Emerging cool white light emission from Dy~(3+)doped single phase alkaline earth niobate phosphors for indoor lighting applications. Dalton Trans.2015;44:17166.
23. Mashangva M, Singh MN, Singh TB. Estimation of optimal trapping parameters relevant to persistent luminescence. Indian J Pure Appl Phys. 2011;49:583.
24. Daniel DJ,Annalakshmi O, Madhusoodanan U, Ramasamy P. Thermoluminescence characteristics and dosimetric aspects of fluoroperovskites(NaMgF_3:Eu~(2+),Ce~(3+)).J Rare Earths. 2014:32:496.
25. KaurN, Singh M, Singh L, Lochad SP.Investigation of thermoluminescence characteristics of gamma irradiated phlogopite mica. Radiat Phys Chem.2013;87:26.
26. Lei BF, YueS, Zhang YZ, Liu YL. Luminescence properties of Sr_2SnO_4:Sm~(3+)afterglow phosphor. Chin Phys Lett. 2010:27, 037201.