P-80: A New Oxide/Oxysulfide Based Phosphor Triad and High-Efficiency Green-Emitting (Y,Gd)[sub 2]O[sub 2]S:Tb Phosphor for FED Applications

Abstract

An oxide/oxysulfide based phosphor triad with particle sizes of around 1micrometer (green Y 2 SiO 5 :Tb or Y 2 O 2 S:Tb, and blue Y 2 SiO 5 :Ce) down to 250nm for the red Y 2 O 3 :Eu is reported. These phosphors perform well in brightness under the conditions necessary for use in FED's and are of suitable size for use in high definition screens. We also report a green emitting Y 2 O 2 S:Tb phosphor that has been prepared by a new method involving homogeneous precipitation of the precursors and a new firing regime. The resulting cathodoluminescent phosphor having submicrometer size particles has a luminous efficiency of 34.6 lm/W at an electron beam accelerating voltage of 5000 V.

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

“…The Tb 3+ ‐activated Gd 2 O 2 S phosphor particles were synthesized through a two‐step method: the first step was the preparation of Tb 3+ ‐doped gadolinium hydroxycarbonate precursor (Gd (OH)CO 3 :Tb 3+ ) via a urea‐based hydrothermal homogeneous precipitation method with minor modifications . The second step was the sulfuration of the Gd (OH)CO 3 :Tb 3+ .…”

“…The higher detection efficiency of the smaller Gd 2 O 2 S:Pr 3+ particles was becuase of their ability to form a thin close‐packed layer with very few “pinholes,” thereby capturing more X‐rays . In the present work, submicron‐sized Gd 2 O 2 S:Tb 3+ phosphor precursor powders were prepared by a urea hydrothermal homogeneous‐precipitation method . In addition, to encapsulate the phosphor particles on the textured surface of monocrystalline silicon (mono‐Si) solar cell, ethylene vinyl acetate (EVA), with excellent optical properties, good thermal stability, and strong adhesion, was selected as the matrix and binder .…”

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

“…Nanometre sized (Y 1Àx Gd x ) 2 O 2 S:Tb 3+ phosphor particles (x values in the range 0 to 1 with 0.1 increments) with activator concentrations of 0.1 and 2 mol% were synthesized using a procedure based on the urea homogenous precipitation method that we have previously described 3,4,10,13 and subsequent calcination at 900 C. The 2 mol% Tb 3+ sample series was also re-red at 1100 C. The following chemicals were used in this study: yttrium oxide and terbium oxide (99.99%, Neomaterials, UK) and gadolinium oxide (99.99%, Ampere Industrie, France); nitric acid (AnalaR, Fisher Scientic, UK), urea (99.9%, Fisher Scientic, UK), sulfur (99.5%, Sigma Aldrich, UK) and sodium carbonate (98%, Alfa Aesar, UK). All chemicals supplied were used without further purication.…”

“…12 Gd 2 O 2 S:Tb 3+ and Y 2 O 2 S:Tb 3+ have also been investigated for use in eld emission displays (FED) where Y 2 O 2 S:Tb 3+ was suggested to be a promising phosphor as the green component. 13 It has been reported that the composition of the lanthanidebased oxysulde host lattice and the concentration of the Tb 3+ dopant cations have a signicant inuence on the emission colour that can range from blue to green. [3][4][5][6] The fact that tuning the composition of the phosphors controls the emission wavelength offers interesting opportunities for these phosphors in a range of novel applications as well as for improvements in current applications.…”

Upconversion- and cathodo-luminescence properties of Yb3+/Ho3+/Li+ tridoped Lu6O5F8 nanoparticles

“…However, fluorides have less favorable chemical, thermal and mechanical properties compared to oxides, and thus are hard to be prepared and handled [5]. Similarly, many efficient sulfide-based compounds have been explored as low-voltage phosphors, such as Y 2 O 2 S: Eu [6], Gd 2 O 2 S: Tb [7], SrGa 2 S 4 : Eu [8], etc. However, sulfide-based materials have many disadvantages, such as chemical instability, corrosion of the emitter cathode, and luminance saturation [9].…”