The enhancement of emission intensity and enlargement of color gamut by a simple local structure substitution with highly thermal stability preserved
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Milićević, Bojana R.
Article (Published version)
© 2019 Elsevier B.V.
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The local crystal structure engineering becomes an important strategy to design new phosphors with enhanced optical and thermal performance of white light-emitting diodes. Herein, a series of Na3Sc2(PO4)3: Eu2+ and KyNa2.97-ySc2(PO4)3: 0.03Eu2+ phosphors were synthesized via traditional high temperature solid-state reaction method. X-ray powder diffraction analysis and Rietveld refinement provide insight in the detailed crystal structure. Furthermore, Eu2+ doped Na3Sc2(PO4)3 exhibits bright blue emission in 400–540 nm spectral range with a maximum value at ~ 460 nm under n-UV light excitation. The concentration quenching mechanism of Eu2+ in Na3Sc2(PO4)3 is certified to be a dipole-dipole interaction. Additionally, crystal structure tailoring is a potential strategy to design new phosphors for particular applications. Therefore, the effects of K+ substitution on the structure and photoluminescence of Eu2+ activated Na3Sc2(PO4)3 is presented in detail. Rietveld refinement data revealed ...that unit cell volume and Na/K–O band length increase when K+ occupy the Na+ sites. This sensitive local structure resulted in a considerable enhancement of the photoluminescence intensity of Eu2+. Incorporation of K+ in the crystal structure is a feasible route to realize fine-tuning of emission color and broaden the color gamut. In the meantime, Na2.7K0.27Sc2(PO4)3: 0.03Eu2+ phosphor exhibits excellent thermal stability at high temperature over a significant radiative recombination of energy transfer from traps to Eu2+. These results confirm that Na2.7K0.27Sc2(PO4)3: 0.03Eu2+ phosphor might be used as a blue component in n-UV chip activated white light-emitting diodes for the next-generation of indoor solid-state lighting applications. © 2019 Elsevier B.V.
Keywords:Cation substitution / Crystal structure / Eu2+ / LED application / Phosphor / Photoluminescence
Source:Optical Materials, 2019, 95, 109201-
- National Natural Science Foundation of China [No. 21801254]
- National Natural Science Foundation of China [No. 51802359]
- National Natural Science Foundation of China [No. U1702254]
- China Postdoctoral Science Foundation [2018M643304]
- Key Research Foundation of the Higher Education Institutions of Henan Province [16A510008]
- Science and Technology Planning Project of Guangdong Province for Applied Science and Technology Research and Development [2017B090917001]
- Science and Technology Planning Project of Guangdong Province for Applied Science and Technology Research and Development [2016B090931007]
- Science and Technology Planning Project of Guangdong Province for Applied Science and Technology Research and Development [2015B090927002]
- Government of Guangzhou city for international joint-project