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Energy Transfer and Up-Conversion in the Erbium Elpasolites Cs_{2}NaEr_{x}Y_{1-x}Cl_{6}

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Campbell M., Flint C.

Acta Physica Polonica A

1996

vol. 90

issue 1

151-160

The luminescence decay curves from the ^{4}F_{9/2} and ^{4}I_{9/2} states of the cubic hexachloroelpasolite crystals Cs_{2}NaEr_{x}Y_{1-x}Cl_{6} (x = 0.001÷1) have been measured over the temperature range 10-300 K. The ^{4}I_{9/2} state undergoes an electric dipole vibronic-electric dipole vibronic cross-relaxation process at 300 K, but this mechanism is inefficient below 165 K. Excitation into the ^{4}F_{9/2} state, results in emission in the green, blue and ultra violet regions. The up-conversion processes which could account for the ultraviolet emission are discussed.

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1 Acta Physica Polonica A

1 1996

1 Campbell M.

1 Flint C.

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Energy Transfer and Up-Conversion in the Erbium Elpasolites Cs_{2}NaEr_{x}Y_{1-x}Cl_{6}