First Evidence of Electron Trapped Ln~(2+) Promoting Afterglow on Eu~(2+), Ln~(3+) Activated Persistent Phosphor-Example of BaZrSi_3O_9:Eu~(2+), Sm~(3+)

Feng Peng; Takatoshi Seto; Yuhua Wang

首页> 外文期刊>Advanced functional materials >First Evidence of Electron Trapped Ln~(2+) Promoting Afterglow on Eu~(2+), Ln~(3+) Activated Persistent Phosphor-Example of BaZrSi_3O_9:Eu~(2+), Sm~(3+)

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First Evidence of Electron Trapped Ln~(2+) Promoting Afterglow on Eu~(2+), Ln~(3+) Activated Persistent Phosphor-Example of BaZrSi_3O_9:Eu~(2+), Sm~(3+)

机译：First Evidence of Electron Trapped Ln~(2+) Promoting Afterglow on Eu~(2+), Ln~(3+) Activated Persistent Phosphor-Example of BaZrSi_3O_9:Eu~(2+), Sm~(3+)

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BaZrSi_3O_9:Eu2+, Sm~(3+) (Em:525 nm) is prepared. The role played by the trivalentco-doping ion Sm~(3+) in the afterglow and the type of trap are clarified.BaZrSi_3O_9:Eu~(2+), Sm~(3+) is found to produce Sm~(2+) during the excitation by X-rayabsorption near-edge structure (XANES), etc., and it is thus proved that Sm~(3+)exists as an electron trap in the afterglow process. In the field of persistentphosphors activated by Eu~(2+) and Re~(3+) such as Sm~(3+) or Dy~(3+) having beenwidely utilized as emergency guide lights, clock faces, etc. for > 25 years, forthe first time it is successfully observed that after excitation Re~(2+) is formed,transferring its electron to 5d band of Eu~(2+), returning to Re~(3+) by itself, wherethe decrease in Sm~(2+) coincides with the increase in Sm3+, and the two decaytime τ_1 and τ_2 of PL (~5D_0→~7F_0) of Sm~(2+) coincides with the two evolution timeof PL (5d→4f ) of Eu~(2+). The behavior of electron transfer from Sm~(2+) to Eu~(2+) asa key of afterglow is detected. The detailed afterglow mechanism is proposedby analysis of thermoluminescence and defect reaction, which is veryimportant for the in-depth investigation of the long afterglow material and thefurther improvement of the mechanism.

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《Advanced functional materials》 |2023年第29期|2300721.1-2300721.13|共13页
作者
Feng Peng; Takatoshi Seto; Yuhua Wang;
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作者单位

National and Local Joint Engineering Laboratory for Optical ConversionMaterials and Technology of National Development and ReformCommissionSchool of Materials and EnergyLanzhou UniversityNo. 222, South Tianshui Road, Lanzhou, Gansu 730000, P. R. China;

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afterglow; electron traps; mechanisms;

First Evidence of Electron Trapped Ln~(2+) Promoting Afterglow on Eu~(2+), Ln~(3+) Activated Persistent Phosphor-Example of BaZrSi_3O_9:Eu~(2+), Sm~(3+)

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