TY - JOUR
T1 - Luminescence and prediction of transition probabilities for solar energy and lasers
AU - Reisfeld, R.
PY - 1985/10
Y1 - 1985/10
N2 - The radiative transitions of trivalent rare earth ions in transparent media can be calculated using the three intensity parameters Ω2, Ω4 and Ω6 and the three matrix elements U2, U4 and U6 connecting any pair of electronic levels of the 4fN configuration. The multiphonon relaxation rates between any pair of electronic levels are determined by two phenomenological parameters α and B which are matrix dependent only. The paper presents a full set of Ω parameters, allowing calculation of radiative transition probabilities in oxide and fluoride crystalline media, and comparison in the amorphous media of oxide, chalcogenide, and fluoride glasses. The phenomenological parameters α and B are tabulated for the same systems. Connections are deduced between the values of the phenomenological parameters, the electronic structure of the ion involved and the chemical nature of the host matrix. An example of cross-relaxation of Ho3+, Nd3+ and Tb3+ represents an additional channel for nonradiative relaxation. The above presented values enable a priori calculations of efficiencies of solar concentrators and cross-sections for laser emission.
AB - The radiative transitions of trivalent rare earth ions in transparent media can be calculated using the three intensity parameters Ω2, Ω4 and Ω6 and the three matrix elements U2, U4 and U6 connecting any pair of electronic levels of the 4fN configuration. The multiphonon relaxation rates between any pair of electronic levels are determined by two phenomenological parameters α and B which are matrix dependent only. The paper presents a full set of Ω parameters, allowing calculation of radiative transition probabilities in oxide and fluoride crystalline media, and comparison in the amorphous media of oxide, chalcogenide, and fluoride glasses. The phenomenological parameters α and B are tabulated for the same systems. Connections are deduced between the values of the phenomenological parameters, the electronic structure of the ion involved and the chemical nature of the host matrix. An example of cross-relaxation of Ho3+, Nd3+ and Tb3+ represents an additional channel for nonradiative relaxation. The above presented values enable a priori calculations of efficiencies of solar concentrators and cross-sections for laser emission.
UR - http://www.scopus.com/inward/record.url?scp=0004701525&partnerID=8YFLogxK
U2 - 10.1016/0022-5088(85)90003-7
DO - 10.1016/0022-5088(85)90003-7
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:0004701525
SN - 0022-5088
VL - 112
SP - 9
EP - 18
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
IS - 1-2
ER -