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Design of a Novel Scandium Silicate Based Blue-Emitting Phosphor with High Efficiency and Robust Thermal Stability for Warm WLEDs and Field Emission Displays

Abstract

A novel blue-emitting phosphor, Na3ScSi2O7: Ce3+ (NSSO: Ce3+), was synthesized with a solid-state method at low temperature successfully. Its crystal structure, band structure, photoluminescence and cathodoluminescence properties were researched in detail. The phase formation and the crystal structure were confirmed by powder X-ray diffraction analysis and Rietveld refinement method, respectively. Under the excitation of n-UV light, the optimal NSSO: 0.02Ce3+ phosphor can yield blue emission centered at 452 nm with high quantum efficiency of 50.9%. The PL intensity of NSSO: 0.02Ce3+ phosphor remains 71.46% of the initial value when the temperature rising from room temperature to 150 oC, indicating a good thermal stability. A WLED lamp was obtained by combing 360 nm n-UV chip with Sr2SiO4: Eu2+, (Ca, Sr)AlSiN3: Eu2+ and NSSO: 0.02Ce3+ phosphors, in which the color coordinates, CCT and CRI are (0.360, 0.348), 4409 K and 90.9, respectively. Moreover, under low voltage electron bombardment, the phosphor can emit blue emission with high luminescent intensity, current saturation and resistance. All the results indicate that the NSSO: Ce3+ phosphor show much potential for the application of both WLEDs and field emission displays (FEDs). Our research has also offered a new insight and perspective that using Sc-based sorosilicates as host can be a proper strategy for developing excellent inorganic luminescence materials.

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Publication details

The article was received on 07 Jun 2019, accepted on 13 Aug 2019 and first published on 14 Aug 2019


Article type: Research Article
DOI: 10.1039/C9QM00370C
Mater. Chem. Front., 2019, Accepted Manuscript

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    Design of a Novel Scandium Silicate Based Blue-Emitting Phosphor with High Efficiency and Robust Thermal Stability for Warm WLEDs and Field Emission Displays

    Q. Zhang, X. Wang, Z. Tang and Y. Wang, Mater. Chem. Front., 2019, Accepted Manuscript , DOI: 10.1039/C9QM00370C

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