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白光LED用球形钼酸钙粉体的控制合成及特性(英)
作者:李兆 赵西成 江元汝 赵亚娟 
单位:西安建筑科技大学材料与矿资学院 西安710055 
关键词:钼酸钙 白光发光二极管 光致发光 水热合成 
分类号:O482.3
出版年,卷(期):页码:2014,42(10):1279-1286
DOI:10.7521/j.issn.0454-5648.2014.10.11
摘要:

 以去离子水和无水乙醇的混合溶液为溶剂,采用水热法成功合成出白光LED用球形CaMoO4基质粉体,制备了Eu3+、Sm3+、Pr3+掺杂的CaMoO4红色荧光材料。对CaMoO4∶Re3+(Re=Eu, Sm, Pr)荧光粉的物相、微观形貌和发光性能进行表征。结果表明:180℃水热反应24h,水与乙醇体积比为3∶1,pH=7.0时可控制合成出规则球形CaMoO4粉体。CaMoO4∶Eu3+粉体在395nm紫外光和465nm蓝光激发下,最强的红光发射峰位于618nm处,对应于Eu3+的5D0→7F2跃迁。CaMoO4∶Sm3+荧光粉激发峰为406和480nm,最强的红光发射峰位于649nm处,对应于Sm3+的4G5/2→6H9/2跃迁。CaMoO4∶Pr3+在453nm蓝光激发下,其最强红光发射峰位于655nm处,对应于Pr3+的3P0→3F2跃迁。而掺杂作为电荷补偿剂的碱金属Li+,可以有效提高CaMoO4∶Re3+(Re=Eu, Sm, Pr)荧光粉的发射强度。由此可知,CaMoO4∶Re3+(Re=Eu, Sm, Pr)有望成为白光LED用红色荧光粉。

 
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 CaMoO4 powder with the spherical particles for white light-emitting diodes (LED) were firstly synthesized by a hydrothermal method using de-ionized water and ethanol as solvents, and then europium (Eu3+), samarium (Sm3+), and praseodymium (Pr3+) ions doped red CaMoO4 phosphors were subsequently prepared. The phases, morphologies, and photoluminescent properties of the as-prepared CaMoO4∶Re3+ (Re=Eu, Sm, Pr) phosphors were investigated. The results indicate that CaMoO4 powder with the spherical particles is obtained at 180℃ and pH 7.0 for 24h when the volume ratio of water to ethanol is 3∶1. The CaMoO4∶Eu3+ powder has a red luminescence due to the transition 5D0→7F2 of Eu3+, and the most intensive emission peak at 618nm under ultraviolet (UV) and blue light irradiation of 395nm and 465nm, respectively. The excitation peaks corresponding to CaMoO4:Sm3+ phosphors are located at 406 and 480nm, and the most intensive emission peak at 649 nm is attributed to the characteristic transition 4G5/2→6H9/2 of the Sm3+ ions. For CaMoO4∶Pr3+ phosphors, the sample has a red luminescence due to the transition 3P0→3F2 of the Pr3+ ions, and the most intensive emission peak at 655 nm under irradiation of blue light with a wavelength of 453nm. The introduction of alkalis ion Li+ as a charge compensator can improve the luminous intensity of CaMoO4∶RE3+(RE=Eu, Sm, Pr). It is indicated that CaMoO4∶Re3+ (Re=Eu, Sm, Pr) red phosphors act as superior candidates for white LED.

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基金项目:
基金项目:国家自然科学基金(21205092);高等学校博士学科点专项科研基金(2011612010012)资助项目。
作者简介:
第一作者:李 兆(1986—),男,博士研究生。 通信作者:赵西成(1951—),男,教授。
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参考文献:

 References:

[1] SHI H, ZHU C, HUANG J, et al. Luminescence properties of YAG∶Ce, Gd phosphors synthesized under vacuum condition and their white LED performances [J]. Opt Mater Expr, 2014, 4(4): 649-655.
[2] HUANG C H, LAI Y T, CHAN T S, et al. A novel green-emitting SrCaSiAl2O7∶Eu2+ phosphor for white LEDs [J]. RSC Adv, 2014, 4(15): 7811-7817.
[3] ZHANG S, LI C, PANG R, et al. Long-lasting phosphorescence study on Y3Al5O12 doped with different concentrations of Ce3+ [J]. J Rare Earths, 2011, 29(5): 426-430.
[4] SUN H, ZHANG X, BAI Z. Synthesis and characterization of nano-sized YAG∶Ce,Sm spherical phosphors [J]. J Rare Earths, 2013, 31(3): 231-234.
[5] YANG Z P, LI X, LI X M, et al. Synthesis of red-emitting phosphors Ca1-xSrxS∶Eu2+ used in white light emitting diodes by combustions [J]. J Chin Ceram Soc, 2006, 34(8): 966-969.
[6] HAO M R, LI G F, HE W W. Preparation and luminescence properties of CaWO4∶Eu3+ red emitting phosphor for white LEDs [J]. J Chin Ceram Soc, 2013, 41(12): 1730-1734.
[7] LIU Y, DING Y, PENG Z. Novel full color greenish-white-emitting Sr3Bi(PO4)3∶Eu2+ phosphor for white light-emitting diodes [J]. Opt Eng, 2014, 53(1): 010501(1-3).
[8] HEESUN Y, DONG K L, YONG S K. Spectral variantions of nano sized Y3Al5O12∶Ce phosphors via codoping substitution and their white LED characteristics [J]. Mater Chem Phys, 2009, 114: 665-669.
[9] ZHANG Y F, LI L, ZHANG X S, et al. Temperature effects on photo luminescence of YAG∶Ce3+ phosphor and performance in white lightemitting diodes [J]. J Rare Earths, 2008, 26(3): 446-449.
[10] ZHANG J, YIN J, LIU P, et al. Preparation and luminescent properties of MgTiO3∶Eu3+ phosphor for white LEDs [J]. J Rare Earths, 2012, 30(10): 1009-1012.
[11] YAN S, ZHANG J, ZHANG X, et al. Enhanced red emission in CaMoO4∶Bi3+, Eu3+ [J]. J Physl Chem C, 2007, 111(35): 13256-13260.
[12] CAVILLI E, BOVERO E, BELLETTI A. Optical spectroscopy of CaMoO4∶Dy3+ single crystals [J]. J Phys: Condens Matter, 2002, 14(20): 5221.
[13] PARCHUR A K, NINGTHOUJAM R S. Preparation and structure refinement of Eu3+ doped CaMoO4 nanoparticles [J]. Dalton Trans, 2011, 40(29): 7590-7594.
[14] LI G, WANG Z, QUAN Z, et al. Growth of highly crystalline CaMoO4∶Tb3+ phosphor layers on spherical SiO2 particles via sol-gel process: Structural characterization and luminescent properties [J]. Cryst Growth Design, 2007, 7(9): 1797-1802.
[15] GUAN L, WEI W, LIU C, et al. Preparation and luminescent properties of LiGd(MoO4)2∶Sm3+ red phosphor [J]. J Chin Ceram Soc, 2013, 41(1): 62-65.
[16] LIN Y, GAO S K. Preparation and photoluminescence of a phosphor SrMoO4∶Dy3+ [J]. J Chin Ceram Soc, 2012, 40(12): 1755-1759.
[17] RAJU G S R, PAVITRA E, KO Y H, et al. A facile and efficient strategy for the preparation of stable CaMoO4 spherulites using ammonium molybdate as a molybdenum source and their excitation induced tunable luminescent properties for optical applications[J]. J Mater Chem, 2012, 22(31): 15562-15569.
 
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