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RISS 인기검색어
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- 저자 : ( Bi Jing Cai ) (검색결과 4 건)
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Cai, Peiqing,Qin, Lin,Chen, Cuili,Wang, Jing,Bi, Shala,Kim, Sun Il,Huang, Yanlin,Seo, Hyo Jin American Chemical Society 2018 Inorganic Chemistry Vol.57 No.6
<P>Mn<SUP>4+</SUP>-doped Y<SUB>2</SUB>MgTiO<SUB>6</SUB> phosphors are synthesized by the traditional solid-state method. Powder X-ray diffraction, scanning electron microscope, and energy-dispersive X-ray spectrometer are employed to characterize the samples. The Mn<SUP>4+</SUP>-doped Y<SUB>2</SUB>MgTiO<SUB>6</SUB> phosphors show the far-red emission at ∼715 nm, which is assigned to the <SUP>2</SUP>E<SUB>g</SUB> → <SUP>4</SUP>A<SUB>2</SUB> spin-forbidden transition of Mn<SUP>4+</SUP>. The temperature-dependent luminescent dynamics of Mn<SUP>4+</SUP> is described by a complete model associated with electron-lattice interaction and spin-orbit coupling. The noncontact optical thermometry of Y<SUB>2</SUB>MgTiO<SUB>6</SUB>:Mn<SUP>4+</SUP> is discussed based on the fluorescence intensity ratio of thermally coupled anti-Stokes and Stokes sidebands of the efficient ∼715 nm far-red emission in the temperature range of 10-513 K. The maximum sensor sensitivity of Y<SUB>2</SUB>MgTiO<SUB>6</SUB>:Mn<SUP>4+</SUP> is determined to be as high as 0.001 42 K<SUP>-1</SUP> at 153 K, which demonstrates potential applications for the optical thermometry at low-temperature environments.</P><P>The vibration sidebands-based Mn<SUP>4+</SUP> doped Y<SUB>2</SUB>MgTiO<SUB>6</SUB> double perovskite was designed for ratiometric optical temperature sensing in the range from 10 to 513 K; the Mn<SUP>4+</SUP> ions can be located at the Ti<SUP>4+</SUP> sites and form MnO<SUB>6</SUB> octahedron with deep red emission under UV excitation. The highest relative temperature sensitivity was obtained as 0.001 42 K<SUP>−1</SUP> at 153 K.</P> [FIG OMISSION]</BR>
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Luminescence properties of sodalite-type Zn<sub>4</sub>B<sub>6</sub>O<sub>13</sub>:Mn<sup>2+</sup>
Chen, Cuili,Cai, Peiqing,Qin, Lin,Wang, Jing,Bi, Shala,Huang, Yanlin,Seo, Hyo Jin Elsevier 2018 Journal of luminescence Vol.199 No.-
<P><B>Abstract</B></P> <P>Luminescence properties of sodalite Zn<SUB>4</SUB>B<SUB>6</SUB>O<SUB>13</SUB>:Mn<SUP>2+</SUP> are investigated by optical and laser excitation spectroscopy in the temperature range 10 – 300 K. The samples of Zn<SUB>4</SUB>B<SUB>6</SUB>O<SUB>13</SUB>:Mn<SUP>2+</SUP> are prepared in the carbon reducing atmosphere. The green emission at 540 nm are observed in Zn<SUB>4</SUB>B<SUB>6</SUB>O<SUB>13</SUB>:Mn<SUP>2+</SUP> for various Mn<SUP>2+</SUP> concentration. Optimum Mn<SUP>2+</SUP> concentration and critical distances between Mn<SUP>2+</SUP> ions in Zn<SUB>4</SUB>B<SUB>6</SUB>O<SUB>13</SUB> are obtained by the luminescence intensity as functions of Mn<SUP>2+</SUP> concentration. The decays of Mn<SUP>2+</SUP> emission depend strongly on Mn<SUP>2+</SUP> concentration due to the energy transfer and energy diffusion in Zn<SUB>4</SUB>B<SUB>6</SUB>O<SUB>13</SUB>:Mn<SUP>2+</SUP>. The fine structures consisting of the intense zero phonon line (ZPL) and weak vibrational sidebands are observed at low temperature. The relevant mechanism of excitation bands, ZPL, vibrational sidebands and the bandwidth as functions of temperature are interpreted in detail by energy level diagram of the 3d<SUP>5</SUP> transition metal ions and configuration coordinated diagram. The high thermal stability of the Zn<SUB>4</SUB>B<SUB>6</SUB>O<SUB>13</SUB>:Mn<SUP>2+</SUP> phosphor are observed in the temperature range 10–300 K.</P>
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Qin, Lin,Bi, Shala,Cai, Peiqing,Chen, Cuili,Wang, Jing,Kim, Sun Il,Huang, Yanlin,Seo, Hyo Jin Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.755 No.-
<P><B>Abstract</B></P> <P>Series of Mn<SUP>4+</SUP>-activated LiLa<SUB>2</SUB>NbO<SUB>6</SUB> red emitting phosphors were prepared by the solid state method. The structural and luminescence properties are investigated on the basis of X-ray diffraction (XRD), emission and excitation spectra, and luminescence decay curves. The LiLa<SUB>2</SUB>NbO<SUB>6</SUB>:Mn<SUP>4+</SUP> phosphors can be efficiently excited by near-UV to blue light and exhibit bright red emission at around 712 nm, which can be assigned to the <SUP>2</SUP>E<SUB>g</SUB>→<SUP>4</SUP>A<SUB>2g</SUB> transition of the 3 d<SUP>3</SUP> electrons in [MnO<SUB>6</SUB>] octahedra. Temperature dependent emission spectra and decay curves from 10 to 480 K are analyzed to understand the luminescence mechanism of Mn<SUP>4+</SUP> in LiLa<SUB>2</SUB>NbO<SUB>6</SUB> lattice. Notably, such a novel red emitting phosphor shows special anti-thermal quenching behavior.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We provide a comprehensive study of the luminescence mechanism of the Mn<SUP>4+</SUP> ion. </LI> <LI> Sharp emission lines belong to vibrational modes are observed at low temperature. </LI> <LI> The LiLa<SUB>2</SUB>NbO<SUB>6</SUB>:Mn<SUP>4+</SUP> phosphor shows special anti-thermal stability at low temperature. </LI> </UL> </P>
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