Probing into the conduction band and type of carriers/traps on red/orange persistent phosphors in vacancy & solid-solution induced (Sr/Ba)<subscript>1−x</subscript>Ca<subscript>x</subscript>Ge<subscript>4−y</subscript>O<subscript>9</subscript>:Mn<superscript>2+</superscript>.
In: Dalton Transactions: An International Journal of Inorganic Chemistry, Jg. 52 (2023-08-28), Heft 32, S. 11047-11061
Online
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Zugriff:
Long-wavelength afterglow has been a key issue in the investigation of afterglow materials. Herein, the orange/red (Sr/Ba)1−xCaxGe4−yO9:0.01Mn2+ is prepared by the introduction of vacancy induction and solid solution. The (Sr/Ba)Ge4O9:Mn2+ hardly possesses an afterglow phenomenon and exhibits only red/orange photo-luminescence (PL) attributed to the d–d transition of Mn2+, while samples with reduction of the Ge4+ content and with replacement by Ca2+ show bright afterglow emission with the peak located at about 612 nm/620 nm. The emerging broadband peak comes from charge transfer involving Mn2+ and nearby defect clusters and the bottom of the conduction band (CB). The introduction of V′′′′Ge creates a defective energy level above the valence band, but the ground state energy difference with Mn2+ is too large (>1 eV) to allow hole transfer, which was confirmed by ultraviolet photoelectron spectroscopy (UPS), spherical aberration-corrected transmission electron microscopy (AC-STEM), charge differential density (CDD) analysis, electron paramagnetic resonance (EPR) analysis, etc. With this achievement, we propose an original design strategy for long-wavelength afterglow and a more reasonable afterglow mechanism, which is of great importance for the investigation of long-wavelength afterglow materials. [ABSTRACT FROM AUTHOR]
Titel: |
Probing into the conduction band and type of carriers/traps on red/orange persistent phosphors in vacancy & solid-solution induced (Sr/Ba)<subscript>1−x</subscript>Ca<subscript>x</subscript>Ge<subscript>4−y</subscript>O<subscript>9</subscript>:Mn<superscript>2+</superscript>.
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Autor/in / Beteiligte Person: | Peng, Feng ; Yuhua, Wang |
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Zeitschrift: | Dalton Transactions: An International Journal of Inorganic Chemistry, Jg. 52 (2023-08-28), Heft 32, S. 11047-11061 |
Veröffentlichung: | 2023 |
Medientyp: | academicJournal |
ISSN: | 1477-9226 (print) |
DOI: | 10.1039/d3dt01513k |
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