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Luminescence Delay and Determination of Nonradiative Relaxation Times

  • É. L. Nolle
Part of the The Lebedev Physics Institute Series book series (LPIS)

Abstract

An analysis is made of the kinetics of the luminescence of a three-level system in which a transition takes place from a lower metastable state (lifetime τ 1) under the influence of excitation pulses of duration t0 to an upper state (lifetime τ 2 < τ 1) from which the system relaxes back to the metastable state. It is shown that if t0τ, the luminescence is delayed after the end of excitation and this delay can be used to calculate the nonradiative relaxation time τ 2. The luminescence delay was observed experimentally when Y3Al5O12:Nd3+ was excited with electrons pulses of t0 ⪝ 3 μsec duration (radiative transitions of Nd3+ from the 4F3/2 level due to radiative relaxation from an S level of the neodymium ions) and t0 = 10 nsec duration (transitions from an S level due to the transfer of energy from the host lattice to Nd3+). It was found that the transfer time was τ 2 = 40 nsec. The delay of the luminescence emitted from electron — hole drops in Ge at 4.2°K was used to determine the drop formation time, which was 200 nsec.

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Copyright information

© Springer Science+Business Media New York 1975

Authors and Affiliations

  • É. L. Nolle

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