Синтез и люминесцентные свойства квантовых точек ядро/оболочка PbS/SiO2
Аннотация
Исследование направлено на разработку приемов создания структур ядро/оболочка на основе коллоидных квантовых точек PbS (КТ PbS) и установление влияния диэлектрической оболочки SiO2 на люминесцентные свойства КТ PbS. Объектами исследования служили КТ PbS, пассивированные молекулами тиогликолевой кислоты (TGA), со средним размером 3.0±0.5 нм и полученные на их основе КТ PbS/SiO2, средний размер 6.0±0.5 нм. Показано, что при пассивации интерфейсов КТ PbS молекулами тиогликолевой кислоты наблюдаются два пика люминесценции при 1100 и при 1260 нм. Обнаружено, что повышение температуры коллоидной смеси до 60 °С способствует росту интенсивности длинноволнового пика. Анализ спектров возбуждения люминесценции обеих полос и стоксова
сдвига показал, что полоса при 1100 нм связана с излучательной аннигиляцией экситона, а при 1260 нм – рекомбинацией на уровнях дефектов. Формирование КТ PbS/SiO2 подавляет рекомбинационную люминесценцию, что указывает на локализацию центров свечения преимущественно на интерфейсах КТ. При этом экситонное свечение при 1100 нм увеличивается по интенсивности
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