Blue Long-lasting Phosphorescence of Ti-doped BaZrO3 Perovskites

Moon, Chiwon; Nishi, Masayuki; Miura, Kiyotaka; Hirao, Kazuyuki

doi:10.2497/jjspm.55.201

Cited by 2 publications

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“…The electrons are trapped by the trap centers, released by heat at room temperature to the initial state of luminescence centers, and recombined with the holes trapped in the luminescence centers ͑Ti 3+ ͒. 26,27 Based on the discussion above, the addition of Ti 3+ ions into ZrO 2 host was thought to lead to the bluish-white afterglow. A distinct afterglow mechanism which is quite applicable in the present system is shown in the inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…These suitable defects ͑traps͒ make an important contribution to the LLP phenomenon in this phosphor. 27 Based on the LLP mechanism discussed above, the LLP phenomenon is assumed to be due to the thermostimulated holes and electrons which are trapped by defect the Ti Zr Ј negative defects may be the hole-trapping centers. We conclude that the peak at 34°C is caused by V O •• , and the peak located at 130°C originates from the Ti Zr Ј defects because the sample sintered in reduction atmosphere showed higher 34°C TL peak intensity.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Optical Property Studies of Nanocrystalline ZrO[sub 2]:Ti Long-Lasting Phosphors

Wang

et al. 2008

J. Electrochem. Soc.

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A facile synthetic route to synthesize the nanocrystalline zirconia particles via preparing polyzirconoxane with zirconium tetraalkoxide is reported, and the luminescent properties of the so-obtained ZrnormalO2:Ti nanophosphors are systematically investigated in this paper. The bluish-white photoluminescence and phosphorescence originating from the recombination of electrons trapped by anion vacancies and the holes created in the valence band, and the Ti3+ ion substituting for Zr4+ is assumed to be the luminescent center. The long afterglow from ZrnormalO2:Ti is attributed to the oxygen vacancies caused by the addition of Ti3+ ions into ZrnormalO2 host. Compared with the bulk ZrnormalO2:Ti , the nanosized phosphors exhibit a longer persistent time because of the increased surface traps due to the large surface-to-volume ratio in the nanoparticles. This long persistent process can be elucidated by a simple possible mechanism.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis and Optical Property Studies of Nanocrystalline ZrO[sub 2]:Ti Long-Lasting Phosphors

Wang

et al. 2008

J. Electrochem. Soc.

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“…11,12 BaZrO 3 phosphor using a solid-state reaction for long-lasting emission and photocatalytic applications. 13,14 The luminescence properties of RE (Yb 3+ , Er 3+ , Tm 3+ , Sm 3+ , and Tb 3+ )doped BaZrO 3 phosphors have been investigated for various optical applications. 15−17 Limited work has been performed on the UV-excited luminescence properties of Eu 3+ -doped BaZrO 3 for LED applications.…”

Section: ■ Introductionmentioning

confidence: 99%

Local Structure and Spectroscopic Properties of Eu³⁺-Doped BaZrO₃

et al. 2019

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Pristine and Eu3+-doped BaZrO3 were synthesized via a solid-state reaction method, and the synthesized samples were systematically characterized. X-ray diffraction confirmed the formation of single and pure phases of cubic-structured BaZrO3. Extended X-ray absorption fine structure (EXAFS) spectroscopy revealed the site occupancy of Eu3+ and coordination environment around the different atomic sites. Photoluminescence (PL) excitation and emission spectra revealed the dominant absorption at 275 nm and a broad emission centered at 400 nm due to oxygen vacancies below the conduction band (CB). The PL emission intensity at 597 nm increased with increasing Eu3+ doping concentration; simultaneously, emission from the defect level decreased. This confirmed the efficient energy transfer from oxygen vacancies to Eu3+. Density functional theory was employed to calculate the density of states (DOS) to explain the mechanisms of the PL phenomenon. DOS also showed the presence of impurity states due to Eu3+ doping within the band-gap region. The coincidence of the oxygen vacancy state with Eu f state at the bottom of the CB confirmed the PL energy-transfer mechanisms from the oxygen vacancy to europium. The excited-state lifetime values of the 5D0 state decreased with increasing doping concentration due to the increase of the nonradiative transition rate. The internal quantum efficiency, small excited-state lifetime, and photometric parameters indicated that 3 mol % Eu3+-doped BaZrO3 can be a suitable candidate for the red-light-emitting device applications.

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Blue Long-lasting Phosphorescence of Ti-doped BaZrO3 Perovskites

Cited by 2 publications

References 14 publications

Synthesis and Optical Property Studies of Nanocrystalline ZrO[sub 2]:Ti Long-Lasting Phosphors

Synthesis and Optical Property Studies of Nanocrystalline ZrO[sub 2]:Ti Long-Lasting Phosphors

Local Structure and Spectroscopic Properties of Eu³⁺-Doped BaZrO₃

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Blue Long-lasting Phosphorescence of Ti-doped BaZrO3 Perovskites

Cited by 2 publications

References 14 publications

Synthesis and Optical Property Studies of Nanocrystalline ZrO[sub 2]:Ti Long-Lasting Phosphors

Synthesis and Optical Property Studies of Nanocrystalline ZrO[sub 2]:Ti Long-Lasting Phosphors

Local Structure and Spectroscopic Properties of Eu3+-Doped BaZrO3

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Local Structure and Spectroscopic Properties of Eu³⁺-Doped BaZrO₃