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.

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。