A novel Na3La( PO4) 2/ LaPO4: Eu blue- red dual- emitting phosphor with high thermal stability for plant growth lighting
A novel Na3La( PO4) 2/ LaPO4: Eu blue- red dual- emitting phosphor with high thermal stability for plant growth lighting
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一种新型高热稳定性Na3La(PO4)2/LaPO4:Eu蓝红双发射荧光粉用于植物生长照明
DOI：
10.1039/c8tc06119j
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发表时间：
2019-02-28
影响因子：
6.4
通讯作者：
Wong, Wai-Yeung
中科院分区：
文献类型：
--
作者：
Xia, Mao;Wu, Xianbo;Wong, Wai-Yeung
采用高温固相反应法合成了一种新型的高热稳定性的Na 3La（PO 4）（3）：xEu（Na 3La（PO 4）（2）/LaPO 4：xEu）蓝红色双相发光材料。X射线粉末衍射（XRD）分析表明，该双发光荧光粉的主体是由Na 3La（PO 4）（2）和LaPO 4两种晶体组成的复合材料，这将实现两相之间的能量传递，从而大大提高发光性能。当与单相磷光体Na 3La（PO 4）（2）：xEu相比时，所合成的双相磷光体的光致发光（PL）光谱在UV激发下显示出显著增强的Eu 2+的在422 nm处的蓝色发射峰（5d-4f，在422 nm附近的宽带）和Eu 3+的在594 nm处的红色发射峰（D-5（0）-F-7（1，2），594和621 nm）。此外，在Li+共掺杂后，磷光体在150 ℃下表现出高的热稳定性，具有高达98.5%的发光保留率，这应归因于引入了几种缺陷。发射光谱与植物光合作用光谱（PAS）吻合较好，表明Na 3La 2（PO 4）（3）：xEu荧光粉在植物生长LED照明中具有良好的应用前景。
A novel Na3La2(PO4)(3):xEu (Na3La(PO4)(2)/LaPO4:xEu) blue-red dual-emission diphasic phosphor with high thermal stability is successfully synthesized by a high temperature solid state reaction. X-ray powder diffraction (XRD) analysis verified that the host of this dual emitting phosphor is a composite material composed of two crystals: Na3La(PO4)(2) and LaPO4, which would realize the energy transfer between the two phases and then greatly enhance the luminescence properties. When compared with the single-phase phosphor Na3La(PO4)(2):xEu, the photoluminescence (PL) spectra of the as-synthesized diphasic phosphor showed significantly enhanced blue emission peaking at 422 nm of Eu2+ (5d-4f, a broadband at around 422 nm) and red emission peaking at 594 nm of Eu3+ (D-5(0)-F-7(1,2), 594 and 621 nm) under UV excitation. Moreover, the phosphor exhibited a high thermal stability at 150 degrees C with up to 98.5% luminescence retention after Li+ co-doping, which should be attributed to the introduction of several defects. The emission spectra matched well with the photosynthetic action spectra (PAS) in plants, indicating that the Na3La2(PO4)(3):xEu phosphor has a promising application in plant growth LED lighting.