Nanosized (Y1−xGdx)2O2S:Tb3+ particles: synthesis, photoluminescence, cathodoluminescence studies and a model for energy transfer in establishing the roles of Tb3+ and Gd3+

Brüninghoff, Robert; Engelsen, Daniel den; Fern, George R.; Ireland, Terry G.; Dhillon, Rupinder; Silver, Jack

doi:10.1039/c6ra09098b

Cited by 9 publications

(13 citation statements)

References 23 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(Y 1−x Gd x ) 2 O 2 S doped with 0.1%Tb 3+ , in which the colour could precisely be tuned by changing the ratio between Y and Gd. 10 Over the whole range of compositions between x = 0 and x = 1 (Y 1−x Gd x ) 2 O 2 S formed solid solutions, satisfying Vegard's law.…”

Section: Introductionmentioning

confidence: 78%

“…Because of these successful syntheses, we decided to prepare (Lu 1−x Gd x ) 2 O 2 S:Tb 3+ by annealing the rare earth hydroxy-carbonate precursors with S and Na 2 CO 3 , as we did in our studies of (Y 1−x Gd x ) 2 O 2 S:Tb 3+ . [2][3][4][5][6]10 We expected to synthesize only (Lu 1−x Gd x ) 2 O 2 S:Tb 3+ , however it soon became apparent that in this phosphor system the preparation chemistry was not simple unlike, our previous studies on the (Y 1−x Gd x ) 2 O 2 S:Tb 3+ phosphors. Initially we did not intend to prepare (Lu 1−x Gd x ) 2 O 3 :Tb 3+ phosphors; however, when we discovered that our samples contained mixtures of oxysulfide and oxide phases, we decided to analyse both phases.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structure and luminescence analyses of simultaneously synthesised (Lu_1−xGd_x)₂O₂S:Tb³⁺ and (Lu_1−xGd_x)₂O₃:Tb³⁺

et al. 2017

Self Cite

View full text Add to dashboard Cite

Herein we describe the synthesis and luminescence of nanosized (LuGd)OS:Tb and (LuGd)O:Tb phosphors with y = 0.1 mol% Tb and y = 2 mol% Tb and x ranging between 0 and 1. The concentration of Gd (x) was varied in steps of 0.1 (molar ratio Gd). The samples at 0.1 < x < 0.7 contained a mixture of (LuGd)O:Tb and (LuGd)OS:Tb, while the samples at x = 0 contained only LuO:Tb. At 0.1 < x < 0.7 LuOS:Tb and GdOS:Tb did not form a solid solution, but rather crystallised into two slightly different hexagonal structures. This behaviour has been explained in terms of segregation of Lu and Gd between the oxide and oxysulfide phases: the oxide phase is more Lu-rich whereas the second oxysulfide phase is more Gd-rich. The photoluminescence spectra of the phosphors with 0.1 mol% Tb showed a modest colour change of the fluorescence light from cyan to green when x was increased from 0 to 1, whereas the samples of the series with 2 mol% Tb yielded essentially green light. From this analysis it was concluded that the colour change of (LuGd)OS:0.1%Tb is caused by increasing energy transfer of the D-level of Tb to the charge transfer band of (LuGd)OS:Tb upon increasing x. Since the samples with 100% Lu consisted of pure cubic LuO:Tb, we had the opportunity to also study the symmetry-related PL of this compound. From this study we concluded that the C-C doublet of the TbD → F transition behaves in the same way as the corresponding doublet in cubic YO:Tb.

show abstract

Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Structure and luminescence analyses of simultaneously synthesised (Lu_1−xGd_x)₂O₂S:Tb³⁺ and (Lu_1−xGd_x)₂O₃:Tb³⁺

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The undoped‐Gd 2 O 2 S particles were prepared in the same route without adding of Tb dopant. The chemical reactions during the fabrication process are described by the follow equations :…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Terbium‐doped gadolinium oxysulfide (Gd 2 O 2 S:Tb 3+ ) is reported as the most commonly used phosphor in commercial X‐ray intensifying screens. The high density (7.34 g/cm 3 ) and wide band gap (4.6‐4.8 eV) enable it to effectively trap X‐ray photons . The intense green emission of the Gd 2 O 2 S:Tb 3+ phosphor under UV excitation implies its great potential of being used as an efficient spectral converter in an attempt to reduce the spectral mismatch losses while improving the overall light absorption in silicon solar cell .…”

Section: Introductionmentioning

confidence: 99%

Improved photovoltaic performance of monocrystalline silicon solar cell through luminescent down‐converting Gd₂O₂S:Tb³⁺ phosphor

Meng

Dehouche

Ireland

et al. 2019

Progress in Photovoltaics

Self Cite

View full text Add to dashboard Cite

This work reports on efforts to enhance the photovoltaic performance of standard ptype monocrystalline silicon solar cell (mono-Si) through the application of ultraviolet spectral down-converting phosphors. Terbium-doped gadolinium oxysulfide phosphor and undoped-gadolinium oxysulfide precursor powders were prepared by a controlled hydrothermal decomposition of a urea homogeneous precipitation method.The resulting rare-earth element hydroxycarbonate precursor powders were then converted to the oxysulfide by annealing at 900°C in a sulfur atmosphere. The asprepared phosphors were encapsulated in ethylene vinyl acetate co-polymer resin and applied on the textured surface of solar cell using rotary screen printing. Comparative results from X-ray powder diffraction, field emission scanning electron microscopy, scanning transmission electron microscopy, and photoluminescence spectroscopy studies on the microstructure and luminescent properties of the materials are reported. We also compared the optical reflectance and external quantum efficiency response of the cells with and without a luminescent phosphor layer. The results obtained on the terbium-doped gadolinium oxysulfide phosphor show clearly that the down-conversion effect induced by the terbium dopant play a crucial role in enhancing the photovoltaic cells' performance. Under an empirical one-sun illumination, the modified cells showed an optimum enhancement of 3.6% (from 16.43% to 17.02%) in conversion efficiency relative to bare cells. In the concentration range of 1 to 2.5 mg/mL, EVA/Gd 2 O 2 S (blank) composites also improve electrical efficiency, but not as much as EVA/Gd 2 O 2 S:Tb 3+ composites.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

“…Y 2 O 3 phosphors doped with Eu 3+ or Tb 3+ and (Lu 1- x Gd x ) 2 O 2 S:Tb 3+ were made in our laboratory by the urea precipitation method [18,30] followed by annealing at 1020 °C in air for the oxides or at 900 °C with S for the oxysulphides [31]. All other phosphor materials were bought from commercial suppliers and used without additional purification [18,19,20].…”

Section: Materials Methods and Equipmentmentioning

confidence: 99%

New Developments in Cathodoluminescence Spectroscopy for the Study of Luminescent Materials

et al. 2017

Self Cite

View full text Add to dashboard Cite

Herein, we describe three advanced techniques for cathodoluminescence (CL) spectroscopy that have recently been developed in our laboratories. The first is a new method to accurately determine the CL-efficiency of thin layers of phosphor powders. When a wide band phosphor with a band gap (Eg > 5 eV) is bombarded with electrons, charging of the phosphor particles will occur, which eventually leads to erroneous results in the determination of the luminous efficacy. To overcome this problem of charging, a comparison method has been developed, which enables accurate measurement of the current density of the electron beam. The study of CL from phosphor specimens in a scanning electron microscope (SEM) is the second subject to be treated. A detailed description of a measuring method to determine the overall decay time of single phosphor crystals in a SEM without beam blanking is presented. The third technique is based on the unique combination of microscopy and spectrometry in the transmission electron microscope (TEM) of Brunel University London (UK). This combination enables the recording of CL-spectra of nanometre-sized specimens and determining spatial variations in CL emission across individual particles by superimposing the scanning TEM and CL-images.

show abstract

Nanosized (Y_1−xGd_x)₂O₂S:Tb³⁺ particles: synthesis, photoluminescence, cathodoluminescence studies and a model for energy transfer in establishing the roles of Tb³⁺ and Gd³⁺

Abstract: Herein we describe the synthesis and spectral analysis of nanosized (Y1−xGdx)2O2S:Tb3+ phosphors between x = 0 and x = 1 with 0.1 and 2 mol% Tb3+.

Cited by 9 publications

References 23 publications

Structure and luminescence analyses of simultaneously synthesised (Lu_1−xGd_x)₂O₂S:Tb³⁺ and (Lu_1−xGd_x)₂O₃:Tb³⁺

Structure and luminescence analyses of simultaneously synthesised (Lu_1−xGd_x)₂O₂S:Tb³⁺ and (Lu_1−xGd_x)₂O₃:Tb³⁺

Improved photovoltaic performance of monocrystalline silicon solar cell through luminescent down‐converting Gd₂O₂S:Tb³⁺ phosphor

New Developments in Cathodoluminescence Spectroscopy for the Study of Luminescent Materials

Contact Info

Product

Resources

About

Nanosized (Y1−xGdx)2O2S:Tb3+ particles: synthesis, photoluminescence, cathodoluminescence studies and a model for energy transfer in establishing the roles of Tb3+ and Gd3+

Abstract: Herein we describe the synthesis and spectral analysis of nanosized (Y1−xGdx)2O2S:Tb3+ phosphors between x = 0 and x = 1 with 0.1 and 2 mol% Tb3+.

Cited by 9 publications

References 23 publications

Structure and luminescence analyses of simultaneously synthesised (Lu1−xGdx)2O2S:Tb3+ and (Lu1−xGdx)2O3:Tb3+

Structure and luminescence analyses of simultaneously synthesised (Lu1−xGdx)2O2S:Tb3+ and (Lu1−xGdx)2O3:Tb3+

Improved photovoltaic performance of monocrystalline silicon solar cell through luminescent down‐converting Gd2O2S:Tb3+ phosphor

New Developments in Cathodoluminescence Spectroscopy for the Study of Luminescent Materials

Contact Info

Product

Resources

About

Nanosized (Y_1−xGd_x)₂O₂S:Tb³⁺ particles: synthesis, photoluminescence, cathodoluminescence studies and a model for energy transfer in establishing the roles of Tb³⁺ and Gd³⁺

Structure and luminescence analyses of simultaneously synthesised (Lu_1−xGd_x)₂O₂S:Tb³⁺ and (Lu_1−xGd_x)₂O₃:Tb³⁺

Structure and luminescence analyses of simultaneously synthesised (Lu_1−xGd_x)₂O₂S:Tb³⁺ and (Lu_1−xGd_x)₂O₃:Tb³⁺

Improved photovoltaic performance of monocrystalline silicon solar cell through luminescent down‐converting Gd₂O₂S:Tb³⁺ phosphor