CaAl_2B_2O_7:Eu的振动光谱和发光特性

采用高温固相反应法，合成了CaAl2B2O7：Eu磷光体。测定了CaAl2B2O7：Eu的振动光谱，结果表明BO3的振动吸收位于1400～1600cm(－1)区域内，AlO6的吸收位于519cm-1。研究了CaAl2B2O7：Eu中Eu(3+)的光谱特性，发现两个不同的Eu(3+)的发光中心。声子伴带研究表明BO3出现在Eu(3+)的周围。

白光发光二极管用CaAl_2B_2O_7:Eu^(3+)微晶的发光性质(英文)

利用高温固相法合成了CaAl2B2O7:Eu3 +微晶。X射线衍射分析表明我们得到了纯相的CaAl2B2O7基质。样品在近紫外光和蓝光激发下能发出红光。发射光谱的主峰位于614nm,对应于Eu3 +的5D0→7F2跃迁。激发光谱中两个主峰位于401nm和471nm,分别与紫外和蓝光LED相匹配。并研究了电荷补偿剂和Eu3 +的浓度对样品发光强度的影响。所有掺入电荷补偿剂(Li+,Na+和K+)样品的发光强度都比没有掺入电荷补偿剂的样品高。其中掺入Li+的样品的发光强度最高。Eu3 +的最佳浓度为6%。CaAl2B2O7:Eu3 +是一种有应用前景的白光LED用红色荧光粉。

Vibrational Spectrum and Luminescence Properties of CaAl_(2)B_(2)O_(7)Eu^(3+)

The vibrational spectrum of the CaAl2B2O7 was investigated. It was shown that the vibrations of the BO3 groups are present in the region of 1400600 cm-1, and the bands at 519 nm-1 may originate from the AlO6 vibration. The luminescence properties of Eu3+ in CaAl2B2O7 were investigated. It was found that the Eu3+ ion in CaAl2B2O7 occupies two different sites. Investigation on the phonon sideband of Eu3+ indicates that BO3 groups are present in the surroundings of Eu3+ ions.