Site-Selective Occupancy of Eu2+ Toward Blue-Light-Excited Red Emission in a Rb3YSi2O7:Eu Phosphor : научное издание | Научно-инновационный портал СФУ

Site-Selective Occupancy of Eu2+ Toward Blue-Light-Excited Red Emission in a Rb3YSi2O7:Eu Phosphor : научное издание

Тип публикации: статья из журнала

Год издания: 2019

Ключевые слова: light-emitting diodes, Red-emitting phosphors, silicates, Site occupancy

Аннотация: Establishing an effective design principle in solid-state materials for a blue-light-excited Eu2+-doped red-emitting oxide-based phosphors remains one of the significant challenges for white light-emitting diodes (WLEDs). Selective occupation of Eu2+ in inorganic polyhedra with small coordination numbers results in broad-band red emission as a result of enhanced crystal-field splitting of 5d levels. Rb3YSi2O7:Eu exhibits a broad emission band at λmax=622 nm under 450 nm excitation, and structural analysis and DFT calculations support the concept that Eu2+ ions preferably occupy RbO6 and YO6 polyhedra and show the characteristic red emission band of Eu2+. The excellent thermal quenching resistance, high color-rendering index Ra (93), and low CCT (4013 K) of the WLEDs clearly demonstrate that site engineering of rare-earth phosphors is an effective strategy to target tailored optical performance.

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Издание

Журнал: Angewandte Chemie - International Edition

Выпуск журнала: Т. 58, 33

Номера страниц: 11521-11526

ISSN журнала: 14337851

Издатель: Wiley Interscience

Авторы

  • Qiao J. (School of Materials Sciences and Engineering,University of Science and Technology Beijing)
  • Xia Z. (State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials,South China University of Technology)
  • Ning L. (Anhui Key Laboratory of Optoelectric Materials Science and Technology,Key Laboratory of Functional Molecular Solids,Ministry of Education,Anhui Normal University)
  • Molokeev M.S. (Department of Physics,Far Eastern State Transport University)
  • Chuang Y.C. (National Synchrotron Radiation Research Center)
  • Zhang Q. (State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials,South China University of Technology)
  • Poeppelmeier K.R. (Department of Chemistry,Northwestern University)

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