Abstract
These days green laser is preferred as a flexible tool for welding direct bonded copper plates used in power electronics to improve electrification of automotive industry. As terbium is known for green emission, Tb3+ doped strontium zinc borate glasses are melt quenched. The broad hump in x-ray diffraction spectra revealed the amorphous nature. Structural modifications and stability of glasses was shown from fourier transform infrared spectra and differential thermal analysis traces. The Judd-Ofelt intensity parameters are calculated to realize the ligand environment among Tb3+ ions in host glass. The Tb3+ concentration dependent fluorescence properties in visible region and the non-radiative decay rates of 5D4→7F5 transition due to resonant energy transfer apart from intensity quenching of 5D3→7F5 transition in green region was studied. A strong peak registered at 542 nm for the transition 5D4→7F5 in the green region of emission spectra under the excitation of 378 nm. The radiative properties for the prominent luminescent transitions 4D5→7FJ (J=6,5,4,3) of Tb3+ ions are measured using Judd-Ofelt parameters. The values σe, βR,η (%), life- time decay and CIE co-ordinates for the transition 5D4→7F5 confirms that this transition is appropriate for potential green laser.
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