The non-exponential decay curves are fitted to the Inokuti and Hirayama model to give the energy transfer parameters between Sm3+ ions. The dominant interaction mechanism for energy transfer process is dipole–dipole interaction. The energy transfer probability (WDA) increases whereas lifetime (τexp) decreases with the increase of Sm3+ concentration in glass. | VNU Journal of Science: Mathematics – Physics, Vol. 34, No. 3 (2018) 71-78 The Studies of Energy Transfer between Sm3+ ions in Lead Sodium Telluroborate Glasses Using Inokuti-Hirayama Model Phan Van Do* . Thuy Loi University, 175 Tay Son, Dong Da, Hanoi, Vietnam Received 28 August 2018, Accepted 17 September 2018 Abstract: Lead sodium telluroborate (LSTB) glasses doped with different concentrations of Sm 3+ ions were prepared by melting method. The excitation, emission spectra and lifetimes of LSTB:Sm3+ have been investigated. The quenching of luminescence intensity happens after mol% concentration of Sm3+ ions. The non-exponential decay curves are fitted to the Inokuti and Hirayama model to give the energy transfer parameters between Sm3+ ions. The dominant interaction mechanism for energy transfer process is dipole–dipole interaction. The energy transfer probability (WDA) increases whereas lifetime (τexp) decreases with the increase of Sm3+ concentration in glass. Keywords: Lead sodium telluroborate glass, Inokuti and Hirayama model. 1. Introduction Luminescence quenching of rare earth (RE) ions in glasses stems from two different mechanisms that are the multiphonon relaxation and energy transfer [1]. The first mechanism is independent of the RE ions concentration. The multiphonon relaxation rate depends on the number of highest energy phonons available in the host that are needed to cover the energy gap between the metastable level and the next lower energy level of Ln ions. In the second mechanisms an excited ion transfers its excitation energy wholly or in part to an unexcited neighbor by multipolar interaction, and next the two interacting ions decay nonradiatively to respective ground states. Importance of this mechanism depends critically on the distance between interacting ions. With increasing Ln concentration in hosts, the distance between Ln ions diminishes and interactions between ions start to increase, leading the increase of the energy .
