Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 875, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.160019
Keywords
Tunable white emission; Photoluminescence; Photostability; Energy transfer efficiency; Quantum efficiency
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2021R1A5A6002853]
- Dongguk University [S-2020-G0001-00057]
- National Research Foundation of Korea [5199990514598] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, highly photostable and novel Gd2TiO5(GT):Dy3+/Eu3+ nanophosphors were reported as single-component white emitting phosphors prepared by sol-gel route. Tunable white light emission was achieved by co-doping various concentrations of Eu3+ ions to the optimized GT:1.5Dy(3+) nanophosphors, showing an increased energy transfer efficiency with rising Eu(3+) ion content for co-doped GT nanophosphors. The results suggest that these GT:Dy3+/Eu3+ nanophosphors can serve as potential single-component white emitting phosphors for UV and/or NUV-based pc-WLEDs.
At present, phosphor-converted white light-emitting diodes (pc-WLEDs), developed by combining an ultraviolet (UV)/near-UV (NUV) LED and a single-component white emitting phosphor, have attracted significant interest and are emerged as the new-generation green light sources. Herein, we report a highly photostable and novel Gd2TiO5(GT):Dy3+/Eu3+ nanophosphors as single-component white emitting phosphors by sol-gel route. Based on X-ray diffraction pattern, Rietveld refinement is performed to authorize the orthorhombic phase of the GT nanophosphors. The nanosized particles with nearly spherical morphology is perceived after annealing at 1100 degrees C. The Dy3+ and Eu3+ ions individually-doped GT nanophosphors exhibited pleasant white and reddish-orange emissions by monitoring with their respective excitation wavelengths. Tunable white light emission is achieved by co-doping the various concentrations of Eu3+ ions to the optimized GT:1.5Dy(3+) nanophosphors under both UV (270 nm) and NUV (362 nm) excitations. The energy transfer probability is discussed and the energy transfer efficiency from Dy3+ to Eu(3+ )ions is calculated from the luminescence decay profiles. On rising the Eu(3+ )ions content from 0.25 to 6 mol%, the energy transfer efficiency is increased from 14% to 73% for co-doped GT nanophosphors. Besides, the optimized samples of Dy3+ and Eu3+ ions individually-doped and co-doped GT samples exhibited high quantum efficiencies and increased photostability. Thus, the acquired results signifying that these GT:Dy3+/Eu3+ nanophosphors can serve as potential single-component white emitting phosphors for UV and/or NUV-based pc-WLEDs. (C) 2021 Elsevier B.V. All rights reserved.
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