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首页> 外文期刊>RSC Advances >Preferential occupancy of Eu3+ and energy transfer in Eu3+ doped Sr2V2O7, Sr9Gd(VO4)(7) and Sr2V2O7/Sr9Gd(VO4)(7) phosphors
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Preferential occupancy of Eu3+ and energy transfer in Eu3+ doped Sr2V2O7, Sr9Gd(VO4)(7) and Sr2V2O7/Sr9Gd(VO4)(7) phosphors

机译：Eu3 +和Eu3 +掺杂SR2V2O7，SR9GD（VO4）（7）和SR2V2O7 / SR9GD（VO4）（7）磷光体中的EU3 +掺杂SR2V2O7，SR9（VO4）（7）磷光体的优先占用

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摘要

The vanadate-based phosphors Sr2V2O7:Eu3+ (SV:Eu3+), Sr9Gd(VO4)(7):Eu3+ (SGV:Eu3+) and Sr9Gd(VO4)(7)/Sr2V2O7:Eu3+ (SGV/SV:Eu3+) were obtained by solid-state reaction. The bond-energy method was used to investigate the site occupancy preference of Eu3+ based on the bond valence model. By comparing the change of bond energy when the Eu3+ ions are incorporated into the different Sr, V or Gd sites, we observed that Eu3+ doped in SV, SGV or SV/SGV would preferentially occupy the smaller energy variation sites, i.e., Sr-4, Gd and Gd sites, respectively. The crystal structures of SGV and SV, the photoluminescence properties of SGV:Eu3+, SV, SGV/SV and SGV/SV:Eu, as well as their possible energy transfer mechanisms are proposed. Interesting tunable colours (including warm-white emission) of SGV/SV:Eu3+ can be obtained through changing the concentration of Eu3+ or changing the relative quantities of SGV to SV by increasing the calcination temperature. Its excitation bands consist of two types of O-2(-) -> V5+ charge transfer (CT) bands with the peaks at about 325 and 350 nm respectively, as well as f-f transitions of Eu3+. The obtained warm-white emission consists of a broad photoluminescence band centred at about 530 nm, which originates from the O-2(-) -> V5+ CT of SV, and a sharp characteristic spectrum (D-5(0)-F-7(2)) at about 615 and 621 nm.
机译：基于钒的磷光体SR2V2O7：EU3 +（SV：EU3 +），SR9GD（VO4）（7）：Eu3 +（SGV：Eu3 +）和SR9GD（VO4）（7）/ SR2V2O7：Eu3 +（SGV / SV：EU3 +）获得固态反应。基于键合价模型，使用粘合能量法研究EU3 +的位点占用偏好。通过将EU3 +离子掺入不同的Sr，V或Gd位点时比较粘合能量的变化，我们观察到在SV，SGV或SV / SGV中掺杂的EU3 +优先占用较小的能量变异位点，即SR-4 ，GD和GD位点分别。提出了SGV和SV的晶体结构，SGV的光致发光性质：EU3 +，SV，SGV / SV和SGV / SV：欧盟以及其可能的能量转移机制。通过改变EU3 +的浓度或通过增加煅烧温度改变SGV至SV的相对量来获得有趣的可调调谐颜色（包括温度耐白色发射）。其激励带由两种类型的O-2（ - ） - > V5 +电荷转移（CT）带分别在约325和350nm处，以及EU3 +的F-F转变。所获得的暖白色发射由宽的光致发光带组成，该宽的光致发光带以约530nm为中心，其源自SV的O-2（ - ） - > V5 + CT，以及尖锐的特征谱（D-5（0）-F- 7（2））在约615和621nm。

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  • 来源
    《RSC Advances》 |2018年第3期|共12页
  • 作者

    Li Ling; Wang Wenjun; Pan Yu; Zhu Yuhan; Liu Xiaoguang; Noh Hyeon Mi; Moon Byung Kee; Choi Byung Chun; Jeong Jung Hyun;

  • 作者单位

    Hubei Univ Minist Educ Hubei Collaborat Innovat Ctr Adv Organochem Mat Key Lab Synth &

    Applicat Organ Funct Mol Wuhan 430062 Hubei Peoples R China;

    Hubei Univ Minist Educ Hubei Collaborat Innovat Ctr Adv Organochem Mat Key Lab Synth &

    Applicat Organ Funct Mol Wuhan 430062 Hubei Peoples R China;

    Hubei Univ Minist Educ Hubei Collaborat Innovat Ctr Adv Organochem Mat Key Lab Synth &

    Applicat Organ Funct Mol Wuhan 430062 Hubei Peoples R China;

    Hubei Univ Minist Educ Hubei Collaborat Innovat Ctr Adv Organochem Mat Key Lab Synth &

    Applicat Organ Funct Mol Wuhan 430062 Hubei Peoples R China;

    Hubei Univ Minist Educ Hubei Collaborat Innovat Ctr Adv Organochem Mat Key Lab Synth &

    Applicat Organ Funct Mol Wuhan 430062 Hubei Peoples R China;

    Pukyong Natl Univ Dept Phys Busan 608737 South Korea;

    Pukyong Natl Univ Dept Phys Busan 608737 South Korea;

    Pukyong Natl Univ Dept Phys Busan 608737 South Korea;

    Pukyong Natl Univ Dept Phys Busan 608737 South Korea;

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