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Borate Phosphors for Radiation Dosimetery
Published in S. K. Omanwar, R. P. Sonekar, N. S. Bajaj, Borate Phosphors, 2022
It is well known that the activation of rare earth ions plays an important role in the development of the novel luminescence materials. Generally, luminescent materials consist of an activator and host. The host must have excellent physical and chemical stability. The selection of activator is dependent upon different applications. Trivalent terbium is a rare earth ion widely used as a dopant in a variety of host matrices and it is generally used as a blue-green-emitting centre in a variety of commercial phosphors. The Tb3+ ion exhibits a series of narrow line emissions located in the range of wavelength 370–650 nm. The blue light below 480 nm can be attributed to the 5D3-7FJ (J = 6, 5. 4, 3) transitions, while the green emission above 480 nm results from the 5D4-7FJ (J = 6, 5, 4, 3) transitions.
Properties and Applications of Rare Earth Oxides, Alloys, and Compounds
Published in A. R. Jha, Deployment of Rare Earth Materials in Microware Devices, RF Transmitters, and Laser Systems, 2019
Note that terbium is widely used as an X-ray phosphor. Terbium alloys are widely used in magneto-electric recording films. Latest research and development activities have analyzed the energy transfer between the terbium-binging peptide and red fluorescent proteins, the interaction between the metal ions and carbohydrates, the detection of bacterial endo-spores in soil, and the use of terbium complex as a luminescent probe for the imaging of endogenous hydrogen-peroxide generation in plant tissues.
Luminescence enhancement of Ce3+/Tb3+ co-doped SiO2 thin film on silicon substrate prepared by sol–gel spin coating process
Published in Journal of Modern Optics, 2021
Feng Guo, Xin Zhang, Li Zhuang, Qinghui Jin, Jiawen Jian, Xiaowei Zhang
Rare earth (RE) ions have already been employed as emitting centres in a number of optical devices with good quantum efficiency [1,10,11]. Terbium is a rare earth ion that, when doped in solid hosts, efficiently emits green light when pumped with an ultraviolet (UV) source. SiO2 has proved to be a good host for a wide variety of RE ions because of its transparency, dopant solubility and ease of production. Among these RE ions, Er3+ doped SiO2 thin films attracted most of the attention since they show an intense emission at 1.55 μm window light, which is suitable for the development of intergrated light sources operating at telecom wavelength. On the other hand, Ce3+, Tb3+ and Ru3+ doped SiO2 thin film has also shown encouraging properties to develop integrated light sources used in display applications. For example, enhanced red emission from SiO2:Ce3+ due to embedding of ZnO nanoparticles has been reported [12]. An enhancement of photoluminescence (PL) intensity of Ce3+ ions induced by energy transfer from ZnO nanoparticles embedded in so-gel SiO2. In 2014, a high sensitization efficiency was achieved by adding Er3+ with SnO2 nanocrystals in silica thin films [13]. Therefore, co-doping rare earth ions is an efficient method to enhance the PL intensity of silica thin film on silicon substrate. Besides, in 2016, Ramirez et al. have studied the property when Ce3+ and Tb3+ co-doped in SiOxNy thin films. In this research, they used electron-cyclotron-resonance plasma enhanced chemical vapour deposition (ECR-PECVD) to fabricate thin film on SiO2 and annealed in N2 protection. This work indicated the feasible of co-doping Ce3+ and Tb3+ in SiO2 thin film, but their fabrication process was relatively complex [14].