硼玻璃中Dy3+及Sm3+的辐射跃迁几率和无辐射跃迁几率

硼玻璃中掺杂Nd3+,Er3+,Tm3+等小能隙的稀土离子,由于硼玻璃声子能量大,多声子无辐射几率大,影响其发光效率。但由于硼玻璃熔点低,加工容易,对于民用上常用的Sm3+,Dy3+,Eu3+,Tb3+等大能隙物质,多声子无辐射跃迁不是主要因素的情况下,发光效率将如何是本文要研究的问题。另外,辐射跃迁性质的研究对于能量传递机理的研究也是很有意义的。

RADIATIVE AND NONRADIATIVE TRANSITION PROBABILITIES OF Dy3+ AND Sm3+ IN BORATE GLASSES

The radiative transition probabilities of Dy3+ and Sm3+ in orate bglasses have been calculated. The nonradiative transition probabilities and the quantum efficiencies have also been estimated from the obtained radiative transition probabilities and the measured decay times.The oscillator strengthes for electric dipole and magnetic dipole transitions in absorption process are expressed as Ped and Pmd in Eq.l.The magnetic dipole transition matrix elements can be calculated using the intermediate-coupling wave functions expressed as linear combinations of LS basis and the reduced matrix elements given by Eq. 3. On the basis of Judd-Ofelt theory, intensity parameters can be obtained from experimental absorption oscillator strtngthes Pex and Eq. 1 by solving some linear equations on the parameters.