Получение, люминесценция и применение боратов LiMeBO3, Me = Mg, Ca, Sr, Ba, Zn, Cd
Аннотация
В обзоре обобщаются и анализируются сведения о получении, строении и спектрально-люминесцентных свойствах боратов на основе LiMeBO3, Me – двухвалентный металл.
Указанные поликристаллические бораты получают традиционно твердофазными реакциями, а также методом самораспространяющегося высокотемпературного синтеза и его модификациями, основанными на реакции горения.
Каркасные структуры боратов лития со щелочноземельными металлами, цинком и кадмием формируются из полиэдров крупных металлов, между которыми размещаются борокислородные треугольники, изолированные друг от друга. Легирование ионами редкоземельных и тяжелых металлов приводит к образованию твердых растворов, обладающих, как правило, дефектной структурой. Примесные ионы активатора часто становятся основной частью центров свечения люминофора. Причиной люминесцентных свойств ионов редкоземельных элементов является
возможность электронных переходов между состояниями в пределах 4f-конфигурации. Обсуждены наиболее вероятные механизмы зарядовой компенсации при гетеровалентном замещении в боратах LiMeBO3 (солегирование и образование катионных вакансий). Показано, что компенсация зарядов при совместном введении в структуру ионов РЗЭ и щелочных металлов положительно влияет на выход эмиссии. Рассмотрены результаты термолюминесцентных, ап-конверсионных, фотолюминесцентных свойств, а также процессов и явлений их вызывающих. Даны пояснения механизма резонансной передачи энергии от сенсибилизатора к активатору на примере Yb3+→Er3+.
Обсуждается возможность применения рассмотренных боратов в качестве люминофоров, излучающих зеленым, синим и красным светом для белых светодиодов, и эффективных материалов для нейтронной дозиметрии персонала и дозиметрии слабого ионизирующего излучения
Скачивания
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