Na_3YSi_3O_9:Ce~(3+),Tb~(3+)荧光粉的制备及发光性能研究
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摘要
O482.31 A摘要:利用高温固相法制备一系列Na33YSi3O9:Ce+,Tb3+荧光粉,通过X-射线衍射仪和光致发光光谱分别对其物相和发光性能进行表征.结果表明:在Na3YSi3O9共掺Ce3+和Tb3+并未改变其晶格结构;激发光谱主要由Tb3+的f-f跃迁以及Ce3+和Tb3+的4f-5d跃迁组成;在320 nm激发下,发射光谱出现Tb3+的f-f和弱Ce3+的5d-4f跃迁发射,其主峰来自于Tb3+的5D4→7F5跃迁;色坐标为(0.2402,0.4429);由于Ce3+对Tb3+的敏化作用和浓度猝灭,Tb3+的发射强度随着Tb3+或Ce3+掺杂量的增加先提高后减弱.Ce3+和Tb3+的最佳掺杂量分别为0.04和0.25.
All phosphors Na3YSi3O9: Ce3 +,Tb3 +were prepared using high-temperature solid-phase method. X-Ray powder diffraction( XRD) and Photoluminescence( PL) spectrum were used to characterize structure and PL properties,respectively. The results show that all Ce3 +and Tb3 +ions dissolved in the Na3YSi3O9 lattice without changing its crystal structure. Excitation spectrum consisted of f- f transitions of Tb3 +and 4f- 5d characteristic transitions of Tb3 +and Ce3 +ions. Under excitation at 320 nm,emission spectrum showed some f- f transitions of Tb3 +and a weak broadband emission of Ce3 +( 5d- 4f). The strongest emission was from 5D4→7F5transition of Tb3 +. The chromaticity coordinate was( 0. 2402,0. 4429). Because of energy transfer from Ce3 +to Tb3 +and concentration quenching,Tb3 + emissions intensity increased then decreased with the increase of Tb3 +or Ce3 +concentration. The optimum Ce3 +and Tb3 +doping concentration was 0. 04 and 0. 25,respectively.
All phosphors Na3YSi3O9: Ce3 +,Tb3 +were prepared using high-temperature solid-phase method. X-Ray powder diffraction( XRD) and Photoluminescence( PL) spectrum were used to characterize structure and PL properties,respectively. The results show that all Ce3 +and Tb3 +ions dissolved in the Na3YSi3O9 lattice without changing its crystal structure. Excitation spectrum consisted of f- f transitions of Tb3 +and 4f- 5d characteristic transitions of Tb3 +and Ce3 +ions. Under excitation at 320 nm,emission spectrum showed some f- f transitions of Tb3 +and a weak broadband emission of Ce3 +( 5d- 4f). The strongest emission was from 5D4→7F5transition of Tb3 +. The chromaticity coordinate was( 0. 2402,0. 4429). Because of energy transfer from Ce3 +to Tb3 +and concentration quenching,Tb3 + emissions intensity increased then decreased with the increase of Tb3 +or Ce3 +concentration. The optimum Ce3 +and Tb3 +doping concentration was 0. 04 and 0. 25,respectively.
引文
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[2]Min J,Yamaguchi T,Kato H,et al.Development of two novel Eu2+-activated phosphors in the Na-Sc-Si-O system and their photoluminescence properties[J].Journal of Luminescence,2014,154:285-289.
[3]Zhang Z Y,Wang Y H,Zhang J C,et al.Luminescent properties of Na3YSi3O9doped with Eu3+under UV-VUV excitation[J].Materials Research Bulletin,2008,43(4):926-931.
[4]Ananias D,Carlos L D,Rocha J.Unusual full-colour phosphors:Na3Ln Si3O9[J].Optical Materials,2006,28(6-7):582-586.
[5]Zhang X G,Zhang J L,Gong M L.Luminescence and energy transfer of La5Si2BO13:A(A=Ce3+/Tb3+/Eu3+/Sm3+)phosphors under UV excitation[J].Materials Letters,2015,(143):71-74.
[6]苏锵.稀土化学[M].郑州:河南科学技术出版社,1993.
[7]Audrey P,Geneviève C,Rachid M.Tb3+-doped yttrium garnets:Promising tunable green phosphors for solidstate lighting[J].Chemical Physics Letters,2010,490(1-3):50-53.
[8]Liao J S,Qiu B,Wen H R,et al.Synthesis and optimum luminescence of monodispersed spheres for Ba WO4-based green phosphors with doping of Tb3+[J].Journal of Luminescence,2010,130(5):762-766.
[9]李松波,赵文玉,樊彬,安胜利.Na2Gd PO4F2∶Tb3+绿色荧光粉阴极射线发光研究[J].光谱学与光谱分析,2011,31(05):1181-1184.