An Example of Identifying the Specific Mechanism of Resonant Energy Transfer: Sb³⁺ → Mn²⁺ in Fluorophosphate Phosphors(Abstract)

Abstract

The kinetics of energy transfer from antimony donor to manganese acceptor in fluorophosphate phosphors has been studied for the purpose of identifying the specific mechanism of resonant energy transfer (1). By comparison of the manganese concentration dependence of the experimental donor quantum yield and of the emission decay curves with the theoretical calculations for dipole-dipole, dipole-quadrupole, and exchange mechanisms, the energy transfer was found to take place through the exchange mechanism. The probability per unit time for the energy transfer by exchange is given by P=KR¹⁶e^-2R/L sin² Θ · cos²⌽ where the empirical parameters were found to be K–48.7 Å ^-16 μ sec^-1 and L=0.55Å. In the absence of manganese acceptors add for the low donor concentrations investigated, the antinomy emission decay curve was found to be exponential over more than two orders of Magnitude with a lifetime of 7.65 + 0.05μ sec.