Photoluminescence Properties of Novel Red-Emitting Mn2+-Activated MZnOS (M = Ca, Ba) Phosphors
Photoluminescence Properties of Novel Red-Emitting Mn2+-Activated MZnOS (M = Ca, Ba) Phosphors
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DOI：
10.1021/cm801990r
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发表时间：
2009-03-24
影响因子：
8.6
通讯作者：
Hintzen, H. T.
中科院分区：
文献类型：
--
作者：
Duan, C. J.;Delsing, A. C. A.;Hintzen, H. T.
研究了新型红色发光材料Mn2+激活的MZnOS(M=Ca，Ba)的光致发光特性。由于Mn2+的T-4(1)((4)G->；(6)A(1)(S-6))跃迁，Mn2+激活的MZnOS荧光粉在550-700 nm范围内显示出一个单一的对称红色发射带。无论激发波长和Mn2+掺杂浓度如何，M=Ca的峰值中心位于614 nm，M=Ba的峰值中心位于634 nm。比较了钙和钡化合物中Mn2+的发光性质。它们的相似之处在于，在250-350 nm的主晶格激发下，由于主晶格(MZnOS)和激活剂(Mn2+)之间的有效能量传递，Mn2+激活的CaZnOS和BaZnOS都可以被有效地激发。一个意想不到的不同之处是，在350-500 nm的波长范围内，Mn2+激活的CaZnOS也可以在Mn2+自身的激发下被有效地激发(d-d跃迁)。这种差异归因于这两种化合物中不同的晶体结构、不同的配位环境和点对称性。指出了这些荧光粉的潜在应用前景。其中，Mn2+激活的CaZnOS在350-500 nm波长范围内具有较高的吸收和较强的激发带，作为一种替代的LED转换发光材料具有很大的应用潜力。
Photoluminescence properties of novel red-emitting Mn2+-activated MZnOS (M = Ca, Ba) phosphors were investigated. Mn2+-activated MZnOS phosphors show a single symmetric narrow red emission band in the wavelength range of 550-700 run due to the T-4(1)((4)G) -> (6)A(1)(S-6) transition of Mn2+. Peak centers are at about 614 rim for M = Ca and 634 nm for M = Ba, regardless of the excitation wavelength and Mn2+ doping concentration. A comparison is made between the luminescence properties of Mn2+ in the Ca versus Ba compound. A similarity between them is that both Mn2+-activated CaZnOS and BaZnOS can be efficiently excited under host lattice excitation in the wavelength range of 250-350 nm due to efficient energy transfer between the host lattice (MZnOS) and activator (Mn2+). An unexpected difference is that Mn2+-activated CaZnOS can also be efficiently excited under the excitation of Mn2+ itself (d-d transitions) in the wavelength range of 350-500 nm. This difference is ascribed to different crystal structures, different coordination environments, and point symmetries for Mn in these two compounds. The potential applications of these phosphors are pointed out. Among them, Mn2+-activated CaZnOS shows great potential for application as an alternative red-emitting LED conversion phosphor due to its high absorption and strong excitation bands in the wavelength range of 350-500 nm.