ABSTRACT

Rare earth ion plays an important role in the solid state lighting industry. Here, the terbium (III) ion doped sodium calcium chlorosulfate phosphor was prepared via wet chemical method. Structure, bonding between each element of the sample and morphology of the sample were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM), which showed that the samples were crystallized in a well known structure. XRD study shows the crystalline nature of the phosphor materials prepared at low temperature. Photoluminescence study of prepared phosphor was done using SHIMADZU Spectrofluorophotometer RF-5301 PC with a xenon lamp as the excitation source. The excitation spectra are obtained between 280 and 430 nm ranges on doping of terbium (III) ion. Among all these transitions excitation at 380 nm is strong excitation owing to ⁷F₆ → ⁵G₆ transition. The emissions from terbium (III) ions are at 416, 437, 490 and 545, 586, 621 nm. These emissions are attributed to ⁵D₃→⁷F₅ (417 nm), ⁵D₃→⁷F₄ (437 nm), ⁵D₄→⁷F₆ (491 nm) and ⁵D₄→⁷F₅ (545 nm), ⁵D₄→⁷F₄ (588 nm), ⁵D₄ → 7F₃ (624 nm) transitions of terbium (III) ions. Among these strong emission peak appears in green region at 545 nm.

摘要

稀土离子在固态照明行业中扮演着重要的角色。在这里，铽（III）离子掺杂的钠钙氯代硫酸钙荧光粉是通过湿化学法制备的。使用 X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 分析样品的结构、每个元素之间的键合和样品的形貌，这表明样品以众所周知的结构结晶。XRD 研究显示了在低温下制备的磷光体材料的结晶性质。使用SHIMADZU 荧光分光光度计RF-5301 PC 和氙灯作为激发源对制备的荧光粉进行光致发光研究。激发光谱是在 280 和 430 nm 范围内对铽 (III) 离子进行掺杂获得的。在 380 nm 的所有这些跃迁激发中，强激发是由于⁷ F ₆ → ⁵ G ₆过渡。铽 (III) 离子的发射波长为 416、437、490 和 545、586、621 nm。这些排放归因于⁵ D ₃ → ⁷ F ₅ (417 nm)、⁵ D ₃ → ⁷ F ₄ (437 nm)、⁵ D ₄ → ⁷ F ₆ (491 nm) 和⁵ D ₄ → ⁷ F ₅ (545 nm), ⁵ D ₄ → ⁷ F ₄ (588 nm),铽 (III) 离子的⁵ D ₄ → 7F ₃ (624 nm) 跃迁。其中，545 nm 处的绿色区域出现强发射峰。