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Hua, Yongbin,Du, Peng,Su Yu, Jae Elsevier 2018 Materials research bulletin Vol.107 No.-
<P><B>Abstract</B></P> <P>The Er<SUP>3+</SUP>-activated LaBMoO<SUB>6</SUB> phosphors were synthesized by a sol-gel method. The photoluminescence (PL) emission intensity was revealed to be dependent on the Er<SUP>3+</SUP> ion concentration and its maximum value was achieved when the doping concentration was 1 mol%. From theoretical analysis, one knows that the concentration quenching mechanism is dominated by the electric dipole-dipole interaction with a critical distance of 28.47 Å. On the basis of the temperature-dependent PL green emission spectra from the <SUP>2</SUP>H<SUB>11/2</SUB> and <SUP>4</SUP>S<SUB>3/2</SUB> thermally coupled levels by means of the fluorescence intensity ratio technique, the temperature sensing properties of the resultant compounds were studied. When the temperature was 483 K, the sensor sensitivity of the studied samples reached up to 0.017 K<SUP>−1</SUP>. It was found that the sensor sensitivity of the prepared phosphors was hardly varied by the doping concentration. These obtained characteristics suggest that the Er<SUP>3+</SUP>-activated LaBMoO<SUB>6</SUB> phosphors have potential applications in optical thermometry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Under 380 nm excitation, all the samples emitted visible green emissions from the Er<SUP>3+</SUP> ions. </LI> <LI> The optimal doping concentration was 1 mol% and the critical distance was 28.47 Å. </LI> <LI> The maximum sensor sensitivity of the studied phosphors was found to be as high as 0.0179 K<SUP>−1</SUP> at 483 K. </LI> <LI> The sensor sensitivity of the obtained samples was independent of Er<SUP>3+</SUP> ion concentration. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Er<SUP>3+</SUP>-activated LaBMoO<SUB>6</SUB> green-emitting phosphors with high sensor sensitivity for optical thermometry.</P> <P>[DISPLAY OMISSION]</P>
Hua, Yongbin,Hussain, Sk. Khaja,Yu, Jae Su Elsevier 2019 CERAMICS INTERNATIONAL Vol.45 No.15
<P><B>Abstract</B></P> <P>A red-emitting Eu<SUP>3+</SUP>-activated double perovskite Sr<SUB>3</SUB>MoO<SUB>6</SUB> phosphor material was successfully synthesized by a high-temperature solid-state reaction. Upon 353 and 467 nm excitations, the prepared phosphors exhibited the feature emission properties of Eu<SUP>3+</SUP> ions with the corresponding characteristic electronic transitions. The concentration quenching of Eu<SUP>3+</SUP> ions was found at 30 mol% and the quadrupole-quadrupole interaction was dominant in quenching process. The chromaticity coordinates for the optimal doping concentration of Eu<SUP>3+</SUP> ions under the 353 and 467 nm excitations were in the pure red region, while the color purity was calculated to be about 94.536 and 94.780%, respectively. The superior luminescence properties of the red-emitting Sr<SUB>3</SUB>MoO<SUB>6</SUB>:0.3Eu<SUP>3+</SUP> phosphor were achieved and with further blending with commercial phosphors, the white light-emitting diode (WLED) devices were fabricated for practical application. The fabricated WLED device based on 385 nm near-ultraviolet (NUV) chip revealed the color-rendering index and color temperature values of 90.96 and 6381 K, respectively. And the soft polydimethylsiloxane film emitted the pure red region under NUV light. These results suggest that this kind of material could be a promising red-emitting phosphor for WLEDs and flexible display film.</P>
Du, Peng,Hua, Yongbin,Yu, Jae Su Elsevier 2018 Chemical engineering journal Vol.352 No.-
<P><B>Abstract</B></P> <P>The Sm<SUP>3+</SUP>-doped Ba<SUB>3</SUB>(VO<SUB>4</SUB>)<SUB>2</SUB> microparticles were successfully synthesized via a simple sol-gel method. Both the recorded three-dimensional photoluminescence (PL) emission spectra and counter lines revealed that the near-ultraviolet light was a proper excitation lighting source for the studied samples. Under 352 nm of irradiation, the effect of Sm<SUP>3+</SUP> ion concentration on the PL emission properties of the microparticles was investigated and the optimum doping concentration was demonstrated to be 4 mol%. Based on the diversity in the thermal quenching performance of VO<SUB>4</SUB> <SUP>3−</SUP> group and Sm<SUP>3+</SUP> ions, a novel self-referencing non-invasion optical thermometer with high sensitivity and superior signal discriminability was designed. By taking the advantage of the temperature-dependent fluorescence intensity ratio between the VO<SUB>4</SUB> <SUP>3−</SUP> group and Sm<SUP>3+</SUP> ions, the optical thermometric properties of the Sm<SUP>3+</SUP>-doped Ba<SUB>3</SUB>(VO<SUB>4</SUB>)<SUB>2</SUB> microparticles in the temperature range of 303–463 K were analyzed. The maximum absolute and relative sensor sensitivities, which were hardly influenced by the PL emission intensity, were obtained to be 0.039 K<SUP>−1</SUP> and 2.24% K<SUP>−1</SUP>, respectively. Furthermore, the emitting color of the resultant compounds was found to be significantly dependent on the external temperature. These results suggest that the Sm<SUP>3+</SUP>-doped Ba<SUB>3</SUB>(VO<SUB>4</SUB>)<SUB>2</SUB> microparticles are a potential candidate for high-performance self-referencing optical thermometer and safety sign applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> All the samples can be excited by NUV light and the optimal doping content was 4 mol%. </LI> <LI> The energy transfer efficiency from VO<SUB>4</SUB> <SUP>3−</SUP> group to Sm<SUP>3+</SUP> ions reached up to 82.3% when <I>x</I> = 0.2. </LI> <LI> The FIR value of PL emission intensities of Sm<SUP>3+</SUP> to VO<SUB>4</SUB> <SUP>3−</SUP> was dependent on the temperature. </LI> <LI> The maximum absolution and relative sensor sensitivities were 0.039 K<SUP>−1</SUP> and 2.24% K<SUP>−1</SUP>, respectively. </LI> <LI> The emitting color relied on the temperature, which makes it suitable for safety sign. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Critic acid-assisted sol-gel synthesis of bifunctional Ba<SUB>3</SUB>(VO<SUB>4</SUB>)<SUB>2</SUB>:3<I>x</I>Sm<SUP>3+</SUP> microparticles for non-contact optical temperature sensor and safety sign.</P> <P>[DISPLAY OMISSION]</P>