Исследовано влияние легирования железом (термодиффузия с поверхности) на люминесценцию монокристаллов селенида цинка в диапазоне длин волн 0.44−0.72 мкм и пространственное распределение центров люминесценции. Методом двухфотонной конфокальной микроскопии получены " плоские" и " объемные" карты краевой (экситонной) и примесно-дефектной люминесценции в указанном выше спектральном диапазоне, как в легированных, так и в нелегированных кристаллах. Показано, что области кристалла с высокой концентрацией железа имеют низкую интенсивность люминесценции в этом диапазоне. Обнаружено, что в процессе диффузии образуется несколько типов примесно-дефектных центров, распределение которых в объеме кристаллов носит сложный характер. Обсуждается природа этих центров.
In the present work, using as an example ZnSe: Fe2+ single crystals, it was experimentally and theoretically studied the effect of the average power of femtosecond laser radiation on the average luminescence power of excitons and impurity-defect centers upon two-photon excitation of the electronic system of a crystal. It has been experimentally shown that the average luminescence power of crystal excitons in the studied range of excitation powers is proportional to 4 degrees of the average excitation radiation power. The average luminescence power of impurity-defect centers has a quadratic character. A theory is constructed that explains the experimentally observed dependencies. It is noted that the nature of the dependence of the crystal luminescence on the pump power during two-photon excitation can be used to estimate the degree of contamination of the crystal by impurity-defect centers.
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