Near UV excited SrAl 2 O 4 :Dy 3+  phosphors for white LED applications

Jamalaiah, B.C.; Babu, Y. Ramesh

doi:10.1016/j.matchemphys.2018.02.025

Cited by 66 publications

(26 citation statements)

References 47 publications

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“…Whereas, vibration bands in region 780–580 cm −1 are assigned to Sr–O antisymmetric stretching. [ 31,35 ] The magnified image of weak signals due to Sr–O vibrations is shown in the inset of Figure 1b. These bands are also shifting upward in intensity.…”

Section: Resultsmentioning

confidence: 99%

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Manju

Jain

Savita

et al. 2021

Physica Status Solidi (a)

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Thermoluminescence (TL) analysis of gamma‐irradiated SrZnO2:Dy nanophosphors elucidates the presence of various trapping centers in forbidden band. Raman and Fourier‐transformed infrared spectra indicate effect on vibrational structure upon doping. Complex glow curves are obtained at varying gamma radiation doses, exhibiting glow features in low (50–180 °C) and high (220–400 °C) temperature regions. The deconvolution of glow curves indicates the presence of TL peaks at ≈100, 143, 202, 269, and 337 °C. The effect of Dy doping is observed as emergence of new glow feature at ≈143 °C. The substitution of trivalent Dy into SrZnO2 host having divalent cations is proposed to be creating DynormalX1+ (X = Sr, Zn) electron traps and normalVnormalX2− hole traps, along with hitherto existing intrinsic defects. The concentration quenching of TL signal is perceived at 3 mol% Dy doping, whereas comparing glow curves for all samples at saturation dose indicate quenching of low‐ and high‐temperature glow features at different doping concentrations. The theoretical track interaction model and empirical three trap one recombination center (3T1R) model is used to explain former and latter effects, respectively. A schematic band model is proposed to predict the trap distribution upon Dy inclusion, responsible for observed TL in SrZnO2:Dy nanophosphors.

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Section: Resultsmentioning

confidence: 99%

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Manju

Jain

Savita

et al. 2021

Physica Status Solidi (a)

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“…An extensive numerical study was conducted by Finley et al [83] to determine the energetically most favourable defects, that might act as electron trapping centres. Experimental observations from thermoluminescence and electron paramagnetic resonance data support the presence of either cation or anion vacancies [19,83,84]…”

Section: Intrinsic Defect Role In the Persistent Luminescence Mechanismmentioning

confidence: 95%

Recent progress in understanding the persistent luminescence in SrAl₂O₄:Eu,Dy

Vitola

Millers

Bite

et al. 2019

Materials Science and Technology

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Ever since the discovery of SrAl2O4:Eu,Dy persistent afterglow material, that can intensively glow up to 20 h, the mechanism of long-lasting luminescence has been a popular area of research. The research is focused on discovering the mechanism of persistent luminescence in order to prolong the duration and intensity of afterglow in a controlled way. Although most researchers agree on the general things, there are still many unclarities and ambiguities to discuss upon. This review paper briefly sketches in the highlights of past research on the luminescence mechanism in SrAl2O4:Eu,Dy, mainly focusing on the research conducted in the past decade dedicated to clearing these ambiguities. This paper provides an overview of the latest persistent luminescence mechanisms offered by researchers.

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“…Dy 3+ ion generally shows two dominant emissions that include the blue and part of the yellow spectra, which are induced by the 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 transitions, respectively. In some cases, the feeble red emission of Dy 3+ assigning to the transition of 4 F 9/2 → 6 H 11/2 could also be observed . The white light could be generated by the Dy 3+ ‐containing materials by the superposition and variation between emitting transitions in blue and yellow areas.…”

Section: Introductionmentioning

confidence: 99%

“…In some cases, the feeble red emission of Dy 3+ assigning to the transition of 4 F 9/2 → 6 H 11/2 could also be observed. [11][12][13][14] The white light could be generated by the Dy 3+ -containing materials by the superposition and variation between emitting transitions in blue and yellow areas. However, this method always faces the lower CRI due to the lack of the green emission.…”

Section: Introductionmentioning

confidence: 99%

New apatite‐type phosphor Ca₉La(PO₄)₅(SiO₄)F₂:Tb³⁺,Dy³⁺ with improved color rendering index

et al. 2019

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Ca 9 La(PO 4 ) 5 (SiO 4 )F 2 :Tb 3+ ,Dy 3+ (CLPSF:Tb 3+ ,Dy 3+ ) phosphors were successfully prepared using the traditional solid-state technique. The crystal structure was refined and the luminescence properties have been examined in detail. The band gap and electronic structure of Ca 9 La(PO 4 ) 5 (SiO 4 )F 2 were performed by the periodic density functional theory (DFT) calculation. The spectral and fluorescence decay dynamics of CLPSF:Tb 3+ ,Dy 3+ show that the energy transfer behavior between Tb 3+ and Dy 3+ ions is observed. The CLPSF:Tb 3+ ,Dy 3+ phosphors can be efficiently excitable at the wavelengths range from 300 to 500 nm. The emission spectrum covers the whole visible part of the spectra with the sharp emission bands in red, green, and blue regions. The correlated color temperature (CCT) and color rendering index (CRI) of white light emission could be improved by the fine-tuning of the Tb 3+ and Dy 3+ ions ration in accordance with the energy transfer behavior. Thus, the CLPSF:Tb 3+ ,Dy 3+ phosphor could be used as a material for the near-ultraviolet (n-UV) and white lightemitting diodes (w-LEDs). K E Y W O R D Sapatite-type structure, CRI, energy transfer, n-UV-convertible phosphor, phosphor, w-LEDs

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Near UV excited SrAl 2 O 4 :Dy 3+ phosphors for white LED applications

Cited by 66 publications

References 47 publications

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Recent progress in understanding the persistent luminescence in SrAl₂O₄:Eu,Dy

New apatite‐type phosphor Ca₉La(PO₄)₅(SiO₄)F₂:Tb³⁺,Dy³⁺ with improved color rendering index

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Near UV excited SrAl 2 O 4 :Dy 3+ phosphors for white LED applications

Cited by 66 publications

References 47 publications

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO2:Dy Nanophosphors

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO2:Dy Nanophosphors

Recent progress in understanding the persistent luminescence in SrAl2O4:Eu,Dy

New apatite‐type phosphor Ca9La(PO4)5(SiO4)F2:Tb3+,Dy3+ with improved color rendering index

Contact Info

Product

Resources

About

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Recent progress in understanding the persistent luminescence in SrAl₂O₄:Eu,Dy

New apatite‐type phosphor Ca₉La(PO₄)₅(SiO₄)F₂:Tb³⁺,Dy³⁺ with improved color rendering index