Physica B: Condensed Matter ( IF 2.8 ) Pub Date : 2020-11-27 , DOI: 10.1016/j.physb.2020.412465 Yogita Kumari , Lokesh Kumar Jangir , Anil Kumar , Manoj Kumar , Kamlendra Awasthi
Terbium doped titania (Tb–TiO2) nanoparticles with different concentration of Tb+3 ions were synthesized by sol-gel method. The crystallite size of nanoparticles decreased with increasing the Tb+3 ions concentration suggesting the inhibition of growth of TiO2 nanoparticles while the phase of nanoparticles was not affected by doping of Tb+3 ions. A marginal red shift in absorption and a decrement in the band gap from ⁓3.18 eV–3.06 eV after doping of Tb+3 ions were observed. The radiative transitions of Tb+3 ions were observed at 489 nm, 542 nm, 495 nm, and 654 nm corresponding to 5D4-7F6, 5D4-7F5, 5D4-7F4, and 5D4-7F3 transitions respectively in PL spectra. The PL intensity of these transitions first increases and then decreases with increasing Tb+3 concentration. The enhancement in PL intensity is due to more Tb+3 ions, and further addition of Tb+3 ions leads to the cluster formation which results in the loss of PL intensity.
中文翻译:
溶胶-凝胶法合成Tb +3离子掺杂的TiO 2纳米粒子的发光和结构行为
采用溶胶-凝胶法合成了不同浓度的Tb +3离子的掺do二氧化钛(Tb-TiO 2)纳米粒子。随着Tb +3离子浓度的增加,纳米颗粒的晶粒尺寸减小,这表明TiO 2纳米颗粒的生长受到抑制,而纳米颗粒的相不受Tb +3离子的掺杂影响。掺杂Tb +3离子后,吸收的边际红移和带隙从⁓3.18eV–3.06 eV减小。Tb的辐射跃迁3在489纳米,542纳米,495处观察到的离子,和对应于654纳米的5 d 4 - 7˚F 6,5 d 4 - 7 ˚F 5,5 d 4 - 7 ˚F 4,和5 d 4 - 7个˚F 3分别在PL光谱转换。这些过渡的PL强度首先随着Tb +3浓度的增加而增加,然后降低。PL强度的提高归因于更多的Tb +3离子,并且进一步添加Tb +3离子会导致团簇形成,从而导致PL强度的损失。