Introduction to phosphors and luminescence

Hussain, Nisar; Ayoub, Irfan; Mushtaq, Umer; Sehgal, Rishabh; Rubab, Seemin; Sehgal, Rakesh; Swart, H.C.; Kumar, Vijay

doi:10.1016/b978-0-323-89856-0.00008-0

Cited by 3 publications

(2 citation statements)

References 154 publications

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“…The following expression can be used to calculate the PL intensity [16]:

I_{t} goodbreak= I_{0} goodbreak+ C_{1} \exp ((), goodbreak- \frac{t}{τ_{1}}) goodbreak+ C_{2} \exp ((), goodbreak- \frac{t}{τ_{2}})

where

I_{t}

and I 0 are the luminescence intensities at times t and 0 respectively, C 1 and C 2 are fitting constants, τ 1 and τ 2 represent fast and slow lifetimes, respectively, and t is time in ms. The average decay time (τ avg ) for the phosphors was calculated using the following formula [37]:

τ_{avg} goodbreak= \frac{A_{1} τ_{1}^{2} + A_{2} τ_{2}^{2}}{A_{1} τ_{1} + A_{2} τ_{2}}

…”

Section: Resultsmentioning

confidence: 99%

Structural, optical, and luminescence properties of Dy³⁺‐activated potassium calcium silicate phosphor for white light‐emitting diodes

Sharma

Maurya

et al. 2023

Luminescence

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A dysprosium (Dy3+)‐activated potassium calcium silicate (K4CaSi3O9) phosphor was prepared using a solid‐state synthesis route. The phosphor had a cubic structure with the space group Pa as confirmed using X‐ray diffraction (XRD) measurements. Details of surface morphology and elemental composition of the as‐synthesized undoped KCS phosphor was obtained using scanning electron microscopy (SEM) and energy‐dispersive X‐ray (EDX) spectroscopy. The chemical structure as well as the vibrational modes present in the as‐prepared KCS phosphor was analyzed using Fourier transform infrared (FT‐IR) spectroscopy. Diffuse reflectance spectra (DRS) were used to determine the optical bandgap of the phosphors and were found to be in the optical range 3.52–3.71 eV. Photoluminescence (PL) spectra showed intense yellow emission corresponding to the 4F9/2→6H13/2 transition under 350 nm excitation. Commission International de l′Eclairage colour chromaticity coordinates were evaluated using the PL spectral data lie within the white region. Dexter theory and the Inokuti–Hirayama (I–H) model were applied to study the nature of the energy transfer mechanism in the as‐prepared phosphors. The relatively high activation energy of the phosphors was evaluated using temperature‐dependent PL (TDPL) data and confirmed the high thermal stability of the titled phosphor. The abovementioned results indicated that the as‐prepared KCS:Dy3+ phosphor was a promising candidate for n‐UV‐based white light‐emitting diodes.

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“…The following expression can be used to calculate the PL intensity [16]:

I_{t} goodbreak= I_{0} goodbreak+ C_{1} \exp ((), goodbreak- \frac{t}{τ_{1}}) goodbreak+ C_{2} \exp ((), goodbreak- \frac{t}{τ_{2}})

where

I_{t}

τ_{avg} goodbreak= \frac{A_{1} τ_{1}^{2} + A_{2} τ_{2}^{2}}{A_{1} τ_{1} + A_{2} τ_{2}}

…”

Section: Resultsmentioning

confidence: 99%

Structural, optical, and luminescence properties of Dy³⁺‐activated potassium calcium silicate phosphor for white light‐emitting diodes

Sharma

Maurya

et al. 2023

Luminescence

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“…), have been largely developed as host compounds for rare‐earth and transition metal ions, because of their high rigidity, superior stability, unique spatial crystal structure, and ecofriendly characterizations. [ 29–31 ] Among them, NaY 9 (SiO 4 ) 6 O 2 has received a lot of attention, and different types of luminescent materials, such as NaY 9 (SiO 4 ) 6 O 2 :Ln 3+ /Yb 3+ (Ln = Tm, Ho), NaY 9 (SiO 4 ) 6 O 2 :Sm 3+ , NaY 9 (SiO 4 ) 6 O 2 :Bi 3+ , and NaY 9 (SiO 4 ) 6 O 2 :Ce 3+ /Eu 3+ , [ 32–35 ] were reported to realize various applications. Despite these, the investigation of the effect of pressure on the spectral properties of NaY 9− x (SiO 4 ) 6 O 2 : x Mn 2+ (NaY 9 (SiO 4 ) 6 O 2 : x Mn 2+ ) compounds has not been performed yet.…”

Section: Introductionmentioning

confidence: 99%

Pressure‐Induced Remarkable Spectral Red‐Shift in Mn²⁺‐Activated NaY₉(SiO₄)₆O₂ Red‐Emitting Phosphors for High‐Sensitive Optical Manometry

Zeng,

Runowski,

Xue

et al. 2023

Advanced Science

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To settle the low sensitivity of luminescent manometers, the Mn2+‐activated NaY9(SiO4)6O2 red‐emitting phosphors with splendid pressure sensing performances are developed. Excited by 408 nm, the resulting products emit bright red emission originating from 4T1(4G) → 6A1 transition of Mn2+, in which the optimal concentration of the activator ion is ≈1 mol%. Moreover, the admirable thermal stability of the developed phosphors is studied and confirmed by the temperature‐dependent emission spectra, based on which the activation energy is derived to be 0.275 eV. By analyzing the pressure‐dependent Raman spectra, the structural stability of the synthesized compounds at extreme conditions is verified. Furthermore, the designed phosphors exhibit remarkable spectral red‐shift at elevated pressure. Especially, as pressure increases from 0.75 to 7.16 GPa, the emission band centroid shifts from 617.2 to 663.4 nm, resulting in a high sensitivity (dλ/dP) of 7.00 nm GPa−1, whereas the full width at half maximum (FWHM) increases from 83.0 to 110.6 nm, leading to the ultra‐high sensitivity (dFWHM/dP) of 10.13 nm GPa−1. These achievements manifest that the designed red‐emitting phosphors are appropriate for ultrasensitive optical manometry. More importantly, the developed manometer is a current global leader in sensitivity, when operating in the band‐width mode, that is, FWHM.

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Photoluminescence Properties, Judd-Ofelt Analysis, and Energy Transfer Mechanisms in Ca3ga4o9:Dy3+ Phosphor: High Thermal Stability and White-Light Emitting Diode Potential

Ayoub,

Mushtaq,

Yagoub

et al. 2023

Preprint

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Introduction to phosphors and luminescence

Cited by 3 publications

References 154 publications

Structural, optical, and luminescence properties of Dy³⁺‐activated potassium calcium silicate phosphor for white light‐emitting diodes

Structural, optical, and luminescence properties of Dy³⁺‐activated potassium calcium silicate phosphor for white light‐emitting diodes

Pressure‐Induced Remarkable Spectral Red‐Shift in Mn²⁺‐Activated NaY₉(SiO₄)₆O₂ Red‐Emitting Phosphors for High‐Sensitive Optical Manometry

Photoluminescence Properties, Judd-Ofelt Analysis, and Energy Transfer Mechanisms in Ca3ga4o9:Dy3+ Phosphor: High Thermal Stability and White-Light Emitting Diode Potential

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Introduction to phosphors and luminescence

Cited by 3 publications

References 154 publications

Structural, optical, and luminescence properties of Dy3+‐activated potassium calcium silicate phosphor for white light‐emitting diodes

Structural, optical, and luminescence properties of Dy3+‐activated potassium calcium silicate phosphor for white light‐emitting diodes

Pressure‐Induced Remarkable Spectral Red‐Shift in Mn2+‐Activated NaY9(SiO4)6O2 Red‐Emitting Phosphors for High‐Sensitive Optical Manometry

Photoluminescence Properties, Judd-Ofelt Analysis, and Energy Transfer Mechanisms in Ca3ga4o9:Dy3+ Phosphor: High Thermal Stability and White-Light Emitting Diode Potential

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Structural, optical, and luminescence properties of Dy³⁺‐activated potassium calcium silicate phosphor for white light‐emitting diodes

Structural, optical, and luminescence properties of Dy³⁺‐activated potassium calcium silicate phosphor for white light‐emitting diodes

Pressure‐Induced Remarkable Spectral Red‐Shift in Mn²⁺‐Activated NaY₉(SiO₄)₆O₂ Red‐Emitting Phosphors for High‐Sensitive Optical Manometry