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New PDF release: Excited State Lifetime Measurements

By J. N. Demas

ISBN-10: 0122089200

ISBN-13: 9780122089206

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Extra info for Excited State Lifetime Measurements

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The decay is nearly exponential, but the small deviations are real and probably arise from different emitting sites in the crystals. 0 500 400 >* 300 <= 2 0 0 100 100 150 200 Time (/xsec) Fig. 3-1. Luminescence decay curve for solid Cu(CF3C02) at room temperature. The solid curve is the observed decay curve, and the dotted curve is the corresponding semilogarithmic plot. The lifetime in this case is approximately 65 /isec. The data were taken on a computer-controlled Tektronix 7912 transient digitizer.

It should be noted that Eq. (4-3) is perfectly general for an exponential decay function and that earlier results can be derived directly from it. For example, if E(t) is zero before time zero and some constant value from 0 < t to infinity, Eq. (3-11) for a simple step function excitation immediately results. If E{t) is a narrow spike at t = 0, then the integral is constant for t > 0 and a simple exponential decay results. C. SUCCESSIVE FIRST-ORDER DECAYS We first consider the commonly occurring case of successive firstorder decays or series decays in which one excited species decays by a first-order or pseudo-first-order process to another excited species which in turn decays to a third species, etc.

As rB increases beyond τ Α , however, progressively less information is contained in r max . Equation (4-8) has been used by Kleinerman and Choi (1968) to measure rates of energy transfer from Tb3+ complex hosts to Eu3+ complexes 48 4. MORE COMPLEX SYSTEMS Fig. 4-2 Fig. 4-3 Fig. 4-2. Decay curves for the system A —> B -> C. In all cases kAB = 5 x 107 sec -1 . A ( ) is the decay curve for [A]. Curves B-I are the decays of B for different values of W * B C . 01/1; H, 1/2; I, 1/4. Curve B is indistinguishable from the case of kBC = 0.

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Excited State Lifetime Measurements by J. N. Demas


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