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Books > Science & Mathematics > Chemistry > Physical chemistry > Quantum & theoretical chemistry
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Understanding Luminescence Spectra and Efficiency Using Wp and Related Functions (Paperback, Softcover reprint of the original 1st ed. 1991)
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Understanding Luminescence Spectra and Efficiency Using Wp and Related Functions (Paperback, Softcover reprint of the original 1st ed. 1991)
Series: Inorganic Chemistry Concepts, 13
Expected to ship within 10 - 15 working days
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There are both a remote and a proximate history in the development
of this book. We would like to acknowledge first the perceptiveness
of the technical administrators at RCA Laboratories, Inc. during
the 1970s, and in particular Dr. P. N. Yocom. Buoyed up by the
financial importance of yttrium oxysulfide: europium as the red
phosphor of color television tubes, they allowed us almost a decade
of close cooperation aimed at understanding the performance of this
phosphor. It is significant that we shared an approach to research
in an industrial laboratory which allowed us to avoid the lure of
"first-principles" approaches (which would have been severely
premature) and freed us to formulate and to study the important
issues directly. We searched for a semiquantitative understanding
of the properties observed in luminescence, i. e., where energy
absorption occurs, where emission occurs, and with what efficiency
this conversion process takes place. We were aware that the nonradi
ative transition rates found in practice vary enormously with
temperature and, for a given activator, with small changes in its
environment. We traced the source of this enormous variation to the
magnitude of the vibrational overlap integrals, which have strong
dependences on the rearrangements occurring during optical
transitions and on the vibrational number of the initial electronic
state. We were willing to excise from the problem the electronic
aspects - the electronic wavefunctions' and their transition
integrals -by treating them as parameters to be obtained from the
experimental data."
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