2006
DOI: 10.1016/j.jallcom.2005.10.063
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Synthesis of new green emitting phosphors based on rare earth oxycarbonates

Abstract: New green emitting phosphors, hexagonal II-type Gd 2 O 2 CO 3 :Tb 3+ and Y 2 O 2 CO 3 :Tb 3+ , were synthesized by the simple flux method and their luminescence properties were compared with that of II-La 2 O 2 CO 3 :Tb 3+ . Bright green emission was observed in each sample and their particle sizes were in submicron scale. The excitation spectrum consisted of a broad band and some sharp peaks, which were corresponding to the 4f-5d transition of Tb 3+ and 4f-4f transition of Gd 3+ and Tb 3+ , respectively. The … Show more

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Cited by 31 publications
(19 citation statements)
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“…These phosphors exhibited a wellknown characteristic of the Tb 3+ emission, and no self-activated emission was observed in the Tb 3+ -undoped Gd 2 O 2 CO 3 sample. The excitation spectra of the samples consist of strong broad bands around 260 nm, which can be attributed to the energy transition from 4f 8 to 4f 7 5d 1 configuration of Tb 3+ [11], as discussed in our previous papers [8,9]. The relative emission intensities compared with the commercial LaPO 4 :Ce 3+ ,Tb 3+ phosphor were 107.6, 110.4, and 110.0% for the Gd 2 O 2 CO 3 :16 at.%Tb 3+ samples prepared at 873, 923, and 973 K, respectively.…”
Section: Methodsmentioning
confidence: 52%
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“…These phosphors exhibited a wellknown characteristic of the Tb 3+ emission, and no self-activated emission was observed in the Tb 3+ -undoped Gd 2 O 2 CO 3 sample. The excitation spectra of the samples consist of strong broad bands around 260 nm, which can be attributed to the energy transition from 4f 8 to 4f 7 5d 1 configuration of Tb 3+ [11], as discussed in our previous papers [8,9]. The relative emission intensities compared with the commercial LaPO 4 :Ce 3+ ,Tb 3+ phosphor were 107.6, 110.4, and 110.0% for the Gd 2 O 2 CO 3 :16 at.%Tb 3+ samples prepared at 873, 923, and 973 K, respectively.…”
Section: Methodsmentioning
confidence: 52%
“…In our previous studies [8,9], the upper limit of the heating temperature in the flux treatment process was 823 K when the oxycarbonate phosphors were prepared in a flow of 10%CO 2 -90%N 2 gas, and the highest relative emission intensity was 101% obtained for Gd 2 O 2 CO 3 :17 at.%Tb 3+ . In the present study, on the contrary, there has been an increase of about 10% in the emission intensity of the Gd 2 O 2 CO 3 :Tb 3+ phosphor by employing pure CO 2 (100%) instead of 10%CO 2 -90%N 2 .…”
Section: Resultsmentioning
confidence: 92%
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