The study of optical properties of metal-organic frameworks (MOF's)
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Abstract
Металл-органические каркасные структуры (МОКС) вызывают большой интерес исследователей благодаря их уникальным структурным и физико-химическим характеристикам, открывающим возможность для их применения в различных областях современных технологий. В данной работе исследуются оптических свойств МОКС с РЗЭ в качестве люминесцентных зондов. В работе исследовано и проанализировано поглощение МОКС. Установлено, что поглощение света данными структурами обусловлено как переходами в металлических кластерах лантаноидов, так и поглощением органического линкера. Одним из возможных процессов, происходящих при поглощении света, является перенос заряда, в том числе и приводящий к переходу Eu3+/Eu2+. Также исследованы люминесцентные свойства МОКС. В фотолюминесценции образцов проявляются только характерные линии лантаноидов, но не линии органического линкера, а возбуждение люминесценции идёт как через металлический кластер, так и через органический линкер. Для система Y/Yb/Er показан эффект апконверсионной люминесценции.
Metal-organic frameworks (MOFs) are of great interest to researchers due to their unique structural and physicochemical characteristics, which opens the possibility for their application in various areas of modern technologies. In this paper, we investigate the optical properties of MOFs with RE metals as luminescent probes. In the work, the absorption of MOFs was studied and analyzed. It is established that the absorption of light by these structures is due to both transitions in the metallic clusters of the lanthanides and to the absorption of the organic linker. One of the possible processes occurring when light is absorbed is charge transfer, including the one leading to the Eu3+/Eu2+ transition. The luminescent properties of MOFs were also investigated. In the photoluminescence of the samples, only the characteristic lines of the lanthanides appear, but not the lines of the organic linker, and the luminescence excitation goes both through the metal cluster and through the organic linker. For the system Y/Yb /Er, the effect of the upconversion luminescence is shown.
Metal-organic frameworks (MOFs) are of great interest to researchers due to their unique structural and physicochemical characteristics, which opens the possibility for their application in various areas of modern technologies. In this paper, we investigate the optical properties of MOFs with RE metals as luminescent probes. In the work, the absorption of MOFs was studied and analyzed. It is established that the absorption of light by these structures is due to both transitions in the metallic clusters of the lanthanides and to the absorption of the organic linker. One of the possible processes occurring when light is absorbed is charge transfer, including the one leading to the Eu3+/Eu2+ transition. The luminescent properties of MOFs were also investigated. In the photoluminescence of the samples, only the characteristic lines of the lanthanides appear, but not the lines of the organic linker, and the luminescence excitation goes both through the metal cluster and through the organic linker. For the system Y/Yb /Er, the effect of the upconversion luminescence is shown.