SrZnO_2∶Eu^(3+),Li^+长波紫外激发红光荧光体的合成及发光性能研究

采用高温固相法合成了一种长波紫外激发的SrZnO2∶Eu3+,Li+发光材料,用X射线衍射谱、荧光光谱对样品进行了表征。结果表明,Eu3+离子在SrZnO2基质中主要占据Sr2+离子不对称性格位,发射来源于5D0→7F2612 nm为主的红光。加入电荷补偿剂Li+离子能显著提高发光强度,350~400 nm内的激发峰也有明显提高,同时观察到来自Eu3+离子高能级5D1→7FJ(J=0~2)的跃迁发射,并对其产生机制进行了初步探讨。实验结果表明,SrZnO2∶Eu3+,Li+是一种有发展前途的长波紫外激发红光荧光体。

稀土红色荧光粉SrZnO_2:Eu^(3+)的发光性能

A series of novel luminescent materials, SrZnO2:M (M=Eu3+, or Eu3+ + Li+) have been synthesized by high-temperature solid-state reaction. The structure and luminescence properties of SrZnO2:Eu3+ phosphor were studied through XRD, photoluminescence and Raman spectroscopy. The excitation spectra show a broad intense band and a number of small peaks corresponding to the inner 4f-shell excitations of Eu3+ (the strongest one is at 395 nm for 7F0-5L6). After SrZnO2:Eu3+ phosphor was co-doped with Li+ ions, its charge transfer band extended to longer wavelengths. This resulted in increase of luminescent quantum efficiency of the sample. SrZnO2:Eu3+,Li+ phosphor can be efficiently excited by longer UV. From the fluorescence spectrum of SrZnO2:Eu3+ phosphor, apart from transition emissions of 5D0 → 7FJ (J=0~4), the transition emissions from 5D1 → 7FJ (J=0~2) have been observed. For the SrZnO2:Eu3+ phosphor, under excitation of UV, the dominant emission is at about 612 nm, due to the 5D0 → 7F2 hypersensitive transition. The incorporation of Li+ ions greatly enhanced the luminescence intensity and made emission peak from 5D0 → 7F2 transition red-shifted.

燃烧法合成SrZnO_2:Eu^(3+),Li^+及荧光性能

采用燃烧法合成了SrZnO2:Eu3+,Li+发光材料,用X射线衍射谱、荧光光谱对样品进行了表征。结果表明,Eu3+和Li+成功掺入SrZnO2基质中,Eu3+离子在基质中主要占据Sr2+离子不对称性格位,发射来源于5D0→7F2615nm为主的红光。加入电荷补偿剂Li+离子的掺入能显著提高发光强度,其影响程度与Eu3+、离子和Li+离子的掺杂比例密切相关。

SrZnO_2:Eu^(3+)红色荧光体的SHS合成及荧光性能

采用自蔓延燃烧法合成了SrZnO2:Eu3+红色发光材料,采用X射线衍射谱、荧光光谱对样品进行了表征。结果表明,Eu3+成功掺入SrZnO2基质中,在基质中主要占据Sr2+不对称性格位,发射来源于5D0→7F2613nm为主的红光,同时产生了较高能级激发态5D1→7FJ(J=0～2)的发射。

Synthesis and Luminescence of SrZnO_2∶Eu^(3+), Li^+ Phosphor by Long Wavelength UV Excitation

SrZnO2 ： Eu^3 ＋ , Li^＋ phosphor powder by long wavelength UV excitation was synthesized by conventional solid-state reaction method. XRD and PL were employed to characterize their properties. The resuits show that Eu^3＋ ions preferentially occupy Sr^2＋ asymmetry cationic sites, thus emitting 612 nm red light originated from ^5D0 to ^7F2 transition. The luminescent intensity can be greatly enhanced with incorporation of Li^＋ ions. The excitation efficiency in range of 350 - 400 nm also increases greatly due to incorporating Li ^＋ ions. SrZnO2 ： Eu^3 ＋ , Li^＋ is a promising redemitting phosphor by long wavelength UV excitation.

稀土发光材料的研究

本文详细的阐述了高温固相稀土发光材料的制备方法,探讨了稀土离子对发光材料的激活原理。用高温固相法制备出以Sr Zn O2为基质,稀土元素铕和金属元素铋为激活剂的光致发光材料,该发光材料所发出的光可以随着两种激活剂的比例的不同而有规律的变化。