Photoluminescence studies on LiNa5(PO4)2:Dy3+, Sm3+ phosphor

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Miyapuram Ravi ◽  
Ghanta Pushpa Chakrapani ◽  
Mandava Balachandrika ◽  
Pavuluri Vasudevarao ◽  
Chendela Nageswararao ◽  
...  
Keyword(s):  
White Light ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
New Class ◽  
Light Region ◽  
Crystalline Nature ◽  
Photoluminescence Studies ◽  
White Light Emitting Diodes ◽  
Good Agreement ◽  
Pure White

Abstract This paper describes the preparation, structure and photoluminescence properties of a new class LiNa5(PO4)2:Dy3+, Sm3+-phosphor. Crystalline nature confirmed by X-ray diffraction. The phases obtained are in good agreement with the standard phase. Excitation dependence and concentration effect on luminescence features are investigated. Color purity and optical bandgap are also estimated for the LiNa5(PO4)2:Dy3+, Sm3+ phosphors. The result shows LiNa5(PO4)2:Dy3+, Sm3+-phosphor excited by 374 nm nUV light produces pure white light than others. Admixing of 4f configurations and energy transfer between dopants are identified while varying the concentration of Sm3+. The CIE coordinates for LiNa5(PO4)2:0.05Dy3+, 0.05Sm3+ (x = 0.309, y = 0.332) are positioned well in white light region and very close to pure white light. The present study on LiNa5(PO4)2:Dy3+, Sm3+-phosphor suggests that it is useful for the fabrication of white light emitting diodes.

Tunable ultra-uniform Cs4PbBr6 perovskites with efficient photoluminescence and excellent stability for high-performance white light-emitting diodes

2021 ◽  
Author(s):  
Yao Li ◽  
Kaimin Du ◽  
Manli Zhang ◽  
Xuan Gao ◽  
Yu Lu ◽  
...  
Keyword(s):  
White Light ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Metal Halide ◽  
Light Emitting ◽  
New Class ◽  
Halide Perovskites ◽  
White Light Emitting Diodes ◽  
Lead Halide ◽  
Excellent Stability

Metal halide perovskites are a new class of promising materials in optoelectronic applications. As optoelectronic properties of the lead halide perovskites are determined largely by their morphology, the morphology of...

Synthesis and luminescence properties of the red phosphor CaZrO3:Eu3+ for white light-emitting diode application

Open Physics ◽  
2011 ◽  
Vol 9 (4) ◽  
Author(s):  
Junli Huang ◽  
Liya Zhou ◽  
Yuwei Lan ◽  
Fuzhong Gong ◽  
Qunliang Li ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diode ◽  
Red Light ◽  
Average Diameter ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Light Emitting ◽  
Near Ultraviolet ◽  
Light Region

AbstractEu3+-doped CaZrO3 phosphor with perovskite-type structure was synthesized by the high temperature solid-state method. The samples were characterized by X-ray diffraction, scanning electron microscopy, fluorescence spectrophotometer and UV-vis spectrophotometer, respectively. XRD analysis showed that the formation of CaZrO3 was at the calcinations temperature of 1400°C. The average diameter of CaZrO3 with 4 mol% doped-Eu3+ was 2µm. The PL spectra demonstrated that CaZrO3:Eu3+ phosphor could be excited effectively in the near ultraviolet light region (397 nm) and emitted strong red-emission lines at 616 nm corresponding to the forced electric dipole 5 D 0 → 7 F 2 transitions of Eu3+. Meanwhile, the light-emitting diode was fabricated with the Ca0.96ZrO3:Eu0.043+ phosphor, which can efficiently absorb ∼ 400 nm irradiation and emit red light. Therefore Ca0.96ZrO3:Eu0.043+ may have applications for a near ultraviolet InGaN chip-based white light-emitting diode.

scholarly journals Luminescence properties of Eu3+ activated Y2MoO6 powders calcined at different temperatures

2020 ◽  
Vol 14 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Nadezda Stankovic ◽  
Marko Nikolic ◽  
Branislav Jelenkovic ◽  
Nina Daneu ◽  
Jelena Maletaskic ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
White Leds ◽  
Calcination Temperatures ◽  
Transmission Electron ◽  
Light Region ◽  
Lower Treatment ◽  
Different Temperatures ◽  
White Light Emitting Diodes

In the last decade, an immense progress has been made in white LEDs, mainly due to the development of red-emitting phosphors. In this paper, we report on the synthesis of Eu3+ activated Y2MoO6 by a self-initiated and self-sustained method. The obtained powder was calcined at various temperatures in the 600-1400?C range and examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence spectroscopy (PL). The results revealed that all powders are single phase Y2MoO6:Eu3+, with particle size in the nanorange at lower treatment temperatures (600 and 800?C) and in the microrange at higher calcination temperatures (1000-1400?C). The obtained powders are promising materials for white light-emitting diodes as they can efficiently absorb energy in 324-425 nm region (near-UV to blue light region) and emit at 611 nm in the red region of the spectrum, while exhibiting high thermal and chemical stability.

The self-reduction synthesis and luminescent properties of Eu2+-Eu3+ activated BaZr0.2Si2O5.4 phosphors with white light emission for white light-emitting diodes

2018 ◽  
Vol 32 (04) ◽  
pp. 1850047 ◽  
Author(s):  
Jianlin Zhong ◽  
Lixin Yu ◽  
Songchu Li ◽  
Xiaoqin Man ◽  
Wei Sun
Keyword(s):  
White Light ◽  
Light Emission ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
White Light Emission ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
Broadband Emission ◽  
White Light Emitting Diodes

The BaZr[Formula: see text]Si2O[Formula: see text]: Eu[Formula: see text]/Eu[Formula: see text] phosphors were prepared with different concentrations of Eu2O3 by a self-reduction method under air condition. The X-ray diffraction and the photoluminescence properties of the prepared samples were analyzed. The emission spectra consisting of a broadband emission from the 4f[Formula: see text]5d transitions of Eu[Formula: see text] and sharp emissions from 5D0-7F[Formula: see text] (J = 0, 1, 2, 3, 4) transitions of Eu[Formula: see text] are observed. The different luminescent colors can be obtained and modulated by doping different concentrations of Eu2O3 and the white light emission can be observed as the concentration of europium is 6%.

White light emissive Europium complex and their versatile applications

2021 ◽  
Author(s):  
Rajamouli Boddula ◽  
Jairam Tagare ◽  
Kasturi Singh ◽  
Sivakumar Vaidyanathan
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Europium Complex ◽  
Single Component ◽  
Light Emitting ◽  
New Class ◽  
White Light Emitting Diodes

Dual emissive single-component white light emissive luminogens are promising color convertors for white light emitting diodes. In this context, a new class of bipolar phenanthroimidazole based (N1 functionalization with Ph,...

Photoluminescence Properties of CaBi4Ti4O15:Dy3+ for White Light-Emitting Diodes

2014 ◽  
Vol 1053 ◽  
pp. 8-14 ◽  
Author(s):  
Xin Wang ◽  
Rui Rui Cui ◽  
Chao Yong Deng
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Yellow Emission ◽  
Potential Candidate ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Light Emitting ◽  
Near Ultraviolet ◽  
Fluorescence Measurements ◽  
White Light Emitting Diodes

This paper studied the structural and optical properties of Dy3+-doped CaBi4Ti4O15 phosphors synthesized by a traditional solid state method. The phosphors have been characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and fluorescence measurements. Upon 450 nm blue light excitation, the phosphors show yellow emission centered at 574 nm with the color coordination of (x=0.44, y=0.54). And the phosphors exhibit a tunable white color emission under the near ultraviolet source by adjusting the ratio of Dy3+ appropriately. The optimal composition of Ca0.93Bi4Ti4O15:0.07Dy3+ generates white light with the color chromaticity of (x=0.31, y=0.36), indicating that CaBi4Ti4O15:Dy3+ phosphor would be a potential candidate for white light emitting diodes (LEDs) applications.

A fluorescein-centered polymer as a phosphor for fabricating pure white light-emitting diodes

2018 ◽  
Vol 5 (5) ◽  
pp. 932-938 ◽  
Author(s):  
Bin Liu ◽  
Han-Yi Duan ◽  
Ya-Ling Wang ◽  
Bin-Yang Du ◽  
Qing Yang ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Yellow Phosphor ◽  
White Leds ◽  
White Light Emitting Diodes ◽  
Blue Chip ◽  
Pure White

Pure white LEDs are fabricated by combining a blue chip with a fluorescein-centered polymer as a single yellow phosphor.

Cerium Doped Garnet Phosphors for Application in White GaN-based LEDs

2001 ◽  
Vol 667 ◽  
Author(s):  
Jennifer L. Wu ◽  
Steven P. Denbaars ◽  
Vojislav Srdanov ◽  
Henry Weinberg
Keyword(s):  
White Light ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
White Leds ◽  
Garnet Phase ◽  
Gan Led ◽  
Traditionally Prepared ◽  
White Light Emitting Diodes ◽  
Down Conversion ◽  
Subsequent Emission

ABSTRACTRecently, renewed interest has emerged for the development of visible light, down-converting phosphors for application in white light emitting diodes (LEDs). In such devices, a blue GaN LED can act as a primary light source, serving as an efficient pump to excite photoluminescence in a phosphor with subsequent emission occurring at lower energies. The combination of blue light from the LED chip and emission from the phosphor(s) produces white light. It was recently reported that a combinatorial approach to synthesize and screen potential inorganic phosphors for use in white LEDs could aid in identifying improved phosphors for blue to yellow down conversion. Solid state thin-film arrays (libraries) based on the garnet structure (A1−x,Bx)3−z(C1−y,Dy)5O12:Ce3+z, where A, B = Y, Gd, Lu, La; C., D = Al, Ga; x and y = 0 to 1.0; and z = 0.03, were synthesized, and x-ray diffraction was used to select library samples of the crystalline garnet phase. Libraries of these various garnets were then characterized spectroscopically and their properties compared to traditionally prepared bulk powder phosphors of similar composition. Emission and excitation trends show that as larger cations are substituted for Y (A = Y), emission and excitation are red-shifted and as larger cations are substituted for Al (C = Al), emission and excitation are blue-shifted. If smaller cations are substituted for Y and Al an opposite trend is observed. Temperature dependence photoluminescence measurements and emission/excitation trends are also examined.

A low-temperature co-precipitation approach to synthesize fluoride phosphors K2MF6:Mn4+(M = Ge, Si) for white LED applications

2015 ◽  
Vol 3 (8) ◽  
pp. 1655-1660 ◽  
Author(s):  
Ling-Ling Wei ◽  
Chun Che Lin ◽  
Mu-Huai Fang ◽  
Mikhail G. Brik ◽  
Shu-Fen Hu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Alkali Metal ◽  
White Light ◽  
Light Emitting Diodes ◽  
White Led ◽  
Light Emitting ◽  
Red Phosphors ◽  
New Class ◽  
Co Precipitation ◽  
White Light Emitting Diodes

A new class of Mn4+activated alkali-metal hexafluoride red phosphors are emerging for white light-emitting diodes because of their sharp red line2Eg→4A2gemissions (600–650 nm) excited by irradiation of4A2g→4T1g(320–380 nm) and4A2g→4T2g(380–500 nm) transitions.

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