Eu_2Mo_4O_(15)∶Gd~(3+)在465nm蓝光激发下的红色发光
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摘要
采用简单的沉淀法制备了白光LED用Eu_2Mo_4O_(15)∶x%Gd~(3+)(x=0,20,40,60)系列荧光粉。在465 nm蓝光激发下,该荧光粉发射强的红光,而且发射强度与Gd~(3+)的掺杂浓度密切相关。当Gd~(3+)浓度为40%时,激发效率和发光效率最大。热特性的研究表明,40%Gd~(3+)掺杂样品的热猝灭激活能约为0.55 eV。~5D_0和~5D_1到电荷迁移带(CTB)的热激发是导致发光热猝灭的主要因素。
In this paper,Eu_2Mo_4O_(15)∶ x% Gd~(3+) ( x = 0,20,40,60) phosphors for white LEDs were prepared by a simple precipitation method. Under 465 nm excitation,the phosphor produces strong red emission,and the intensity is closely related to the doping concentration of Gd~(3+) . When the concentration of Gd~(3+) is 40%,the excitation efficiency and luminous efficiency are maximized. The studies on thermal properties have shown that for the 40% Gd~(3+) doped sample,the activation energy for the thermal quenching process is about 0. 55 eV. The thermal excitation of ~5D_0 and ~5D_1 to charge transition band( CTB) is responsible for the thermal quenching of luminescence.
In this paper,Eu_2Mo_4O_(15)∶ x% Gd~(3+) ( x = 0,20,40,60) phosphors for white LEDs were prepared by a simple precipitation method. Under 465 nm excitation,the phosphor produces strong red emission,and the intensity is closely related to the doping concentration of Gd~(3+) . When the concentration of Gd~(3+) is 40%,the excitation efficiency and luminous efficiency are maximized. The studies on thermal properties have shown that for the 40% Gd~(3+) doped sample,the activation energy for the thermal quenching process is about 0. 55 eV. The thermal excitation of ~5D_0 and ~5D_1 to charge transition band( CTB) is responsible for the thermal quenching of luminescence.
引文
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[12]GOU J,FAN J Y,LUO M,et al.Sr8Zn Sc(PO4)7∶Eu3+,Li+novel red-emitting phosphors:synthesis and photoluminescence properties[J].2017,86:234-240.
[13]LEI Y Q,SONG H W,YANG L M,et al.Upconversion luminescence,intensity saturation effect,and thermal effect in Gd2O3∶Er3+,Yb3+nanowires[J].The Journal of Chemical Physics,2005,123(17):174710.
[14]QIAO X B,TSUBOI T,SEO H J.Correlation among the cooperative luminescence,cooperative energy transferred Eu3+-emission,and near-infrared Yb3+emission of Eu3+-doped Li Yb(Mo O4)2[J].Journal of Alloys and Compounds,2016,687:179-187.
[2]董丽敏.白光LED用几种典型发光材料的制备[M].北京:化学工业出版社,2014.
[3]TIAN Y,CHEN B J,HUA R N,et al.Optical transition,electron-phonon coupling and fluorescent quenching of La2(Mo O4)3∶Eu3+[J].Journal of Applied Physics,2011,109(5):053511.
[4]SAHA S,DAS S,GHORAI U K,et al.Controlling nonradiative transition centers in Eu3+activated Ca Sn O3nanophosphors through Na+co-doping:realization of ultrabright red emission along with higher thermal stability[J].The Journal of Physical Chemistry C,2015,119(29):16824-16835.
[5]LI P L,WANG Z J,GUO Q L,et al.Luminescence,energy transfer and thermal stability of Li Ba B9O15∶Sm3+,Eu3+for white LEDs[J].Materials Research Bulletin,2015,70:789-794.
[6]吴佳宁,曹伟,张巍灏,等.Na Gd(WO4)2∶Eu3+在394 nm和464 nm激发下的发光及热稳定性[J].中国照明电器,2017(3):17-20.
[7]徐叙2),苏勉曾.发光学与发光材料[M].北京:化学工业出版社,2004.
[8]JIANG T,XING M M,TIAN Y,et al.Up-conversion luminescence of Er2Mo4O15under 980 nm and 1550 nm excitation[J].RSC Advances,2016,6(111):109278-109285.
[9]ZHANG B Y,HAN L,QI Y,et al.Theoretical analysis on quenching mechanisms for Lu2O3∶Eu3+nanospheres[J].Journal of Materials Science:Materials in Electronics,2017,28(23):18015-18021.
[10]WANG Y R,LIU X H,NIU P F,et al.Novel Gd2Mo4O15∶Eu3+red-emitting phosphors for UV,NUV and blue LED applications[J].Journal of Luminescence,2017,184:1-6.
[11]NIU P F,LIU X H,WANG Y R,et al.Photoluminescence properties of a novel red-emitting phosphor Ba2La V3O11∶Eu3+[J].Journal of Materials Science Materials in Electronics,2018,29(1):124-129.
[12]GOU J,FAN J Y,LUO M,et al.Sr8Zn Sc(PO4)7∶Eu3+,Li+novel red-emitting phosphors:synthesis and photoluminescence properties[J].2017,86:234-240.
[13]LEI Y Q,SONG H W,YANG L M,et al.Upconversion luminescence,intensity saturation effect,and thermal effect in Gd2O3∶Er3+,Yb3+nanowires[J].The Journal of Chemical Physics,2005,123(17):174710.
[14]QIAO X B,TSUBOI T,SEO H J.Correlation among the cooperative luminescence,cooperative energy transferred Eu3+-emission,and near-infrared Yb3+emission of Eu3+-doped Li Yb(Mo O4)2[J].Journal of Alloys and Compounds,2016,687:179-187.