Enhanced luminescence and tunable color of Sr 8 CaSc(PO 4 ) 7 :Eu 2+ , Ce 3+ , Mn 2+ phosphor by energy transfer between Ce 3+ -Eu 2+ -Mn 2+
Enhanced luminescence and tunable color of Sr 8 CaSc(PO 4 ) 7 :Eu 2+ , Ce 3+ , Mn 2+ phosphor by energy transfer between Ce 3+ -Eu 2+ -Mn 2+
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DOI：
10.1016/j.jallcom.2017.10.099
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发表时间：
2018-01
影响因子：
6.2
通讯作者：
Jingyan Fan;J. Gou;Yali Chen;Binxun Yu;S. Liu
中科院分区：
文献类型：
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作者：
Jingyan Fan;J. Gou;Yali Chen;Binxun Yu;S. Liu
采用Rietveld精炼法对Sr8CaSc(PO4)7:Eu2+, Ce3+， Mn2+荧光粉的晶体结构进行了细化和测定。通过xrd谱图和Van Uitert方程证实了Sr8CaSc(PO4)7基体材料中Eu2+、Ce3+和Mn2+在Ca2+位点的占据。所设计的Eu2+→Mn2+、Ce3+→Mn2+和Ce3+→Eu2+→Mn2+的三能转移过程发生在Sr8CaSc(PO4)7荧光粉中，并通过它们的衰减曲线得到了进一步的验证。计算得到的能量传递效率表明，Ce3+→Mn2+的能量传递对Mn2+离子的发射增强起主要作用。Sr8CaSc(PO4)7:xEu2+,yCe3+，zMn2+荧光粉的色度和色温通过三能传递和不同激发能在较宽的范围内进行调节，在311 nm激发下分别为（0.2914,0.3396），7606 K到（0.4458,0.3303），2013 K，在370 nm激发下分别为（0.2248,0.5466），8000 K到（0.3978,0.4932），4231 K。同时，在Sr8CaSc(PO4)7:1%Eu2+, 2.5%Ce3+， 2%Mn2+荧光粉中，通过三能转移和311 nm的激发能，量子效率提高了36.3%。制备的310和370 SCSPO-LED的色度和色温分别为（0.241,0.345），10818 K和（0.339,0.254），4673 K，证明Sr8CaSc(PO4)7:xEu2+,yCe3+，zMn2+荧光粉在NUV wled上具有潜在的应用价值。
The crystal structure of Sr8CaSc(PO4)7:Eu2+, Ce3+, Mn2+phosphor was refined and determined from Rietveld refinement method. The occupation for Eu2+, Ce3+at Ca2+ion site and Mn2+at Sc3+site in Sr8CaSc(PO4)7host material were proved by the XRDs profiles and Van Uitert equation. The designed tri-energy transfer process of Eu2+→Mn2+, Ce3+→Mn2+and Ce3+→Eu2+→Mn2+occurred in Sr8CaSc(PO4)7phosphor, and furtherly certified by their decay curves. The corresponding calculated energy transfer efficiencies indicated that the energy transfer Ce3+→Mn2+made the main contribution on the emission enhancement of Mn2+ion. The chromaticity and color temperature of Sr8CaSc(PO4)7:xEu2+,yCe3+,zMn2+phosphors were conveniently adjusted in a broad region by the tri-energy transfer and different excitation energy, which is from (0.2914, 0.3396), 7606 K to (0.4458, 0.3303), 2013 K under 311 nm excitation and (0.2248, 0.5466), 8000 K to (0.3978, 0.4932), 4231 K under 370 nm excitation, respectively. Meanwhile, the corresponding quantum efficiency was improved up to 36.3% in Sr8CaSc(PO4)7:1%Eu2+, 2.5%Ce3+, 2%Mn2+phosphor by tri-energy transfer and high excitation energy 311 nm. The corresponding fabricated 310 SCSPO-LED and 370 SCSPO-LED showed the chromaticity and color temperature as (0.241, 0.345), 10818 K and (0.339, 0.254), 4673 K respectively, that prove Sr8CaSc(PO4)7:xEu2+,yCe3+,zMn2+phosphors have potential application value on NUV WLEDs.