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Design, synthesis, crystal structure and luminescent properties of a new tantalum-phosphate KBiTaPO with negligible concentration quenching and good thermostability
The luminous efficiency of rare-earth (Ln
3+
)-doped luminescent materials suffers greatly from the negative concentration quenching effect, which can be surmounted by a large separation of Ln
3+
ions in the host lattice. Herein, this study reports a novel tantalum-phosphate K
3
BiTaP
3
O
13
(KBTP) that possesses a 'chain-like' structure when viewed along the
c
-axis, containing [TaO(PO
4
)
2
]
∞
, K
∞
and [Bi(PO
4
)]
∞
chains. UV-Vis spectroscopy and density functional theory (DFT) calculations reveal that K
3
BiTaP
3
O
13
has an indirect band-gap of 3.99 eV, making it suitable as a luminescent host matrix. A series of Eu
3+
or Tb
3+
phosphors KBTP:
x
Eu/Tb (
x
= 0.1-1) were prepared and their fluorescent performance was studied. Due to the Bi
3+
ions being far apart in the KBTP host, the negative concentration quenching effect of the prepared phosphors was greatly limited, even when the concentration of Eu/Tb reached up to 80% replacing Bi
3+
. Moreover, both phosphors had good heat-resistance properties at 30-200 °C, keeping 85.6% (KBTP:0.8Eu) and 71.3% (KBTP:0.8Tb) of the initial intensity at 200 °C. These results preliminarily suggest that KBTP is promising as a host material for both Eu
3+
and Tb
3+
fluorescence.
This work reports a new host template, K
3
BiTaP
3
O
13
, for both Eu
3+
and Tb
3+
luminescence, providing a 'dimensional obstacle' to suppress negative concentration quenching with a high density of Eu
3+
or Tb
3+
.
Sprache
–
Identifikatoren
eISSN: 2052-1553
DOI: 10.1039/c9qi01279f
Titel-ID: cdi_rsc_primary_c9qi01279f
Format
–
Weiterführende Literatur
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