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LiBa12(BO3)7F4 (LBBF) crystals doped with Eu3+, Tb3+, Ce3+: structure and luminescence propertiesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или ScopusДата последнего поиска статьи во внешних источниках: 10 июля 2024 г.
- Авторы: Bekker T.B., Ryadun A.A., Davydov A.V., Rashchenko S.V.
- Журнал: Dalton Transactions
- Том: 52
- Номер: 24
- Год издания: 2023
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- Первая страница: 8402
- Последняя страница: 8413
- DOI: 10.1039/d3dt01279d
- Аннотация: The luminescent properties of single crystals and polycrystalline samples of LiBa12(BO3)7F4 (LBBF) dopedand co-doped with Eu3+, Tb3+, and Ce3+ have been studied in order to disclose their potential for applicationin white light-emitting diodes. Deciphering of LBBF:Eu3+ crystal structure (P42/mbc) makes it possibleto determine the scheme of heterovalent isomorphic substitution 3Ba2+ ← 2Eu3+ + □, □ – vacancy inbarium sites. Luminescent properties of LBBF crystals co-doped with Eu3+, Tb3+, Ce3+ and Eu3+, Tb3+ arecompared. Both crystals demonstrate the luminescence close to day light with CIE coordinates and correlatedcolor temperature (0.280; 0.305), 9232 K for LBBF:Eu3+,Tb3+,Ce3+ and (0.353; 0.390), 4849 K forLBBF:Eu3+,Tb3+ at 300 K at 370 nm excitation. The study of polycrystalline samples LBBF:Ce3+, LBBF:Tb3+,and LBBF:Eu3+, using X-ray diffraction, shows that the homogeneity regions of solid solutions differ significantly.In solid solutions LBBF:Tb3+ and LBBF:Eu3+, a gradual change in symmetry in the “tetragonal →orthorhombic → tetragonal” series takes place as the concentration of the dopant increases. Whenexcited at a wavelength 395 nm, LBBF:Eu3+ samples with the content of Eu3+ 0.5 wt% and 2 wt% demonstrateintense red light with a high quantum yield of 63 and 60%, respectively, which allows them to beused as red components of composite phosphors for white LEDs.
- Добавил в систему: Беккер Татьяна Борисовна