scholarly journals Effective Red Compensation ofSr2SiO4 : Dy3+Phosphor by CodopingMn2+Ions and Its Energy Transfer

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Le Zhang ◽  
Zhou Lu ◽  
Pengde Han ◽  
Lixi Wang ◽  
Qitu Zhang
Keyword(s):  
Energy Transfer ◽  
Energy Transfer Process ◽  
Solid State Reaction Method ◽  
Photoluminescence Properties ◽  
Red Emission ◽  
White Leds ◽  
Chromaticity Coordinates ◽  
Single Matrix ◽  
Cie Chromaticity ◽  
Electric Multipoles

Mn2+ions codoped Sr2SiO4 : Dy3+phosphors were prepared by the solid-state reaction method using NH4Cl as the flux. Their phase compositions, photoluminescence properties, and the energy transfer process were systematically investigated. All Mn/Dy codoped powders wereα′-Sr2SiO4. The codoping concentration range of Mn2+was≤4.0 mol% to keep the structure undamaged. The broad red emission of Mn2+centered at 647 nm in Sr2SiO4 : Mn, Dy powders, which effectively compensated the red emission of Sr2SiO4 : Dy3+phosphor. The CIE chromaticity coordinates dramatically changed from (0.310, 0.340) to (0.332, 0.326) due to the red enhancement via the energy transfer from Dy3+to Mn2+. This energy transfer is realized by the exchange interaction. But the luminescence quenching of Sr2SiO4 : Dy, Mn phosphor was mainly caused by the electric multipoles interaction. The concentration optimized (Sr0.96, Mn0.02, Dy0.02)2SiO4phosphor with high and almost pure white emission has great potential to act as a single-matrix white phosphor for white LEDs.

scholarly journals Luminescence and energy transfer of warm white-emitting phosphor Mg2Y2Al2Si2O12:Dy3+,Eu3+ for white LEDs

RSC Advances ◽  
2021 ◽  
Vol 11 (52) ◽  
pp. 32707-32716
Author(s):  
Zizhong Zhu ◽  
Chunjing Tao ◽  
Zhijun Wang ◽  
Zhiping Yang ◽  
Panlai Li
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Color Temperature ◽  
White Leds ◽  
Warm White Light ◽  
Chromaticity Coordinates ◽  
Cie Chromaticity

MYAS:xDy3+,yEu3+ can produce warm white light with CIE chromaticity coordinates of (0.4071, 0.3944) and relative color temperature of 3500 K.

scholarly journals Synthesis and Characterization of a Novel Sm+3 Activated NaCdVO4 Phosphors for Red Emitting Material

2021 ◽  
Author(s):  
Marwa Enneffati ◽  
Mohammed Rasheed ◽  
Narjes Aouani ◽  
Bassem Louati ◽  
Kamel Guidara ◽  
...  
Keyword(s):  
Solid State Reaction Method ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
White Leds ◽  
Chromaticity Coordinates ◽  
Cie Chromaticity ◽  
Simple Solid State Reaction ◽  
Reflectance Data

Abstract Sm3+ activated NaCdVO4 phosphors were prepared by the simple solid-state reaction method. X-ray diffraction, dispersive energy (EDS), scanning electron microscope (SEM), infrared as well as photoluminescence (PL) techniques were used to characterize obtained samples. Irregular and non-uniform structures were observed by SEM. EDS spectra confirmed the presence of Na, Cd, V, O and Sm elements in each sample. Uuder 405nm excitation, the NaCd1 − xVO4: xSm (x = 0.01, 0.03 and 0.05) exhibits a bright red emission consisting mainly of four wavelength peaks at 556, 593, 650 and 700 nm. The highest emission intensity was found with a composition of x = 0.05. The analysis of PL spectra suggest that studied samples can be used as a red emitting phosphors candidates for fabrication of white LEDs. The CIE chromaticity coordinates of prepared samples were close to the blue-emitting phosphors for NaCdVO4 and red-emitting ones for NaCd0.99Sm0.01VO4, NaCd0.97Sm0.03VO4, and NaCd0.95Sm0.05VO4. The band gap energies of phosphors were calculated from reflectance data using K-M function.

A New Deep Red-Emitting Mn2+-Activated SrLaGa3S6O Phosphor

2012 ◽  
Vol 531-532 ◽  
pp. 145-148 ◽  
Author(s):  
Rui Jin Yu ◽  
Jin Young Park ◽  
Hyun Kyoung Yang ◽  
Byung Kee Moon ◽  
Byung Chun Choi ◽  
...  
Keyword(s):  
Broad Band ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
White Led ◽  
Photoluminescence Excitation ◽  
Led Lighting ◽  
Display Devices ◽  
Chromaticity Coordinates ◽  
Standard Values ◽  
Cie Chromaticity

A new deep red-emitting Mn2+-activated SrLaGa3S6O phosphor was first prepared by a solid-state reaction method. Their luminescence properties were investigated by photoluminescence excitation and emission spectra. The emission spectrum shows a broad band with an emission maximum at 668 nm under the host excitation of 340 nm. The full width at half maximum (FWHM) of the emission peak is about 83 nm. The CIE chromaticity coordinates (x = 0.673 and y = 0.312) shows that the phosphor emission is in the deep red region and were very near to the NTSC standard values for red. Since the excitation band of the phosphor lies in the near UV excitable region, giving a deep red emission, it can be used for applications in near UV phosphor converted white LED lighting and display devices.

scholarly journals Lead Borate Glasses and Glass-Ceramics Singly Doped with Dy3+ for White LEDs

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5022
Author(s):  
Agata Górny ◽  
Marta Kuwik ◽  
Wojciech A. Pisarski ◽  
Joanna Pisarska
Keyword(s):  
White Light ◽  
Glass Ceramics ◽  
Borate Glasses ◽  
Spectroscopic Techniques ◽  
Lead Borate ◽  
White Leds ◽  
Lead Borate Glasses ◽  
Chromaticity Coordinates ◽  
Potential Applications ◽  
Cie Chromaticity

In this paper, some series of lead borate glasses and glass ceramics singly doped with Dy3+ ions were prepared and then studied using spectroscopic techniques. Our research includes mainly studies of the luminescence properties of received materials for white light. The luminescence bands associated with the characteristic 4F9/2→6H15/2 (blue), 4F9/2→6H13/2 (yellow) and 4F9/2→6H11/2 (red) transitions of trivalent dysprosium in lead borate systems are well observed. In particular, the Commission Internationale de I’Eclairage (CIE) chromaticity coordinates (x, y) were calculated in relation to potential applications for white light-emitting diodes (W-LEDs). Their values depend on the relative B2O3/PbO ratios and PbX2 contents (where X = Cl, F, Br) in glass composition. For glass-ceramics, the chromaticity coordinates are changed significantly under different excitation wavelengths.

Effects of Sm3+ Doping on the Photoluminescence Properties of Ca9Eu1-xSmx(VO4)7 Red-Emitting Phosphors

2012 ◽  
Vol 512-515 ◽  
pp. 1488-1493 ◽  
Author(s):  
Li Hong Liu ◽  
Rong Jun Xie ◽  
Xu Dong Sun ◽  
Qing Huang ◽  
Naoto Hirosaki
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Excitation Energy ◽  
Solid State Reaction ◽  
Emission Intensity ◽  
Solid State Reaction Method ◽  
Photoluminescence Properties ◽  
Reaction Method ◽  
White Leds ◽  
Uv Led

This paper reports the photoluminescence properties of Ca9Eu1-xSmx(VO4)7 (x=0.2-0.4) synthesized at 1250 oC in air for 12 h using traditional solid-state reaction method. With the increase of Sm3+ substitution amount, purity Ca9Eu1-xSmx(VO4)7 phase was obtained even when the Eu3+ ions were totally substituted by Sm3+. The experimental results showed that when Sm3+ was codoped with Eu3+ into Ca9Eu1-xSmx(VO4)7 crystal structure, Sm3+ would act as a sensitizer and transfer the excitation energy to Eu3+ ions and finally enhance the emission intensity of Ca9Eu1-xSmx(VO4)7 under 405 nm excitation, which leads to more favorite of this kind of phosphor used in UV LED based white LEDs.

Luminescence Properties and Synthesis of SrMgAl10O17:Mn4+ Red Phosphor for White Light-Emitting Diodes

2016 ◽  
Vol 16 (4) ◽  
pp. 3489-3493 ◽  
Author(s):  
Renping Cao ◽  
Hongdong Xue ◽  
Xiaoguang Yu ◽  
Fen Xiao ◽  
Donglan Wu ◽  
...  
Keyword(s):  
Red Light ◽  
Solid State Reaction Method ◽  
Luminescence Properties ◽  
Conventional Solid State Reaction ◽  
Light Emitting ◽  
White Leds ◽  
Structure Morphology ◽  
Optimal Doping Concentration ◽  
Cie Chromaticity ◽  
White Light Emitting Diodes

A series of Mn4+ doped SrMgAl10O17 phosphors are synthesized by a conventional solid-state reaction method in air, and their crystal structure, morphology, and fluorescence properties are investigated. The luminescence properties show clearly that SrMgAl10O17:Mn4+ phosphor can be excited by UV (200–380 nm), near UV (380–420 nm), and blue (420–480 nm) bands of LEDs chip, and emits red light in the range of 600 nm to 750 nm with satisfying CIE chromaticity coordinates (0.7207, 0.2793). The optimal doping concentration of Mn4+ ion is ∼1 mol%, and its lifetime is ∼1.15 ms. The possible luminous mechanism of Mn4+ ion is discussed by Tanabe-Sugano diagram. These experiment results indicate that Mn4+ doped SrMgAl10O17 phosphors can be a potential application as a red-emitting phosphor candidate in white LEDs.

scholarly journals Color-tunable light emission of SrLa4-x-ySi3O13:xTb3+, yEu3+ phosphors by energy transfer process for warm white LEDs

AIP Advances ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 015119 ◽  
Author(s):  
Bing Peng ◽  
Kaixin Song ◽  
Shuangshuang Zhang ◽  
Shaohua Shen ◽  
Junming Xu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Transfer Process ◽  
Light Emission ◽  
Energy Transfer Process ◽  
White Leds ◽  
Color Tunable

Photoluminescence Properties of Sulfur-Doped Sr3SiO5: Eu2+ Phosphor for White LEDs

2013 ◽  
Vol 634-638 ◽  
pp. 2498-2501
Author(s):  
Zhi Qiang Wang ◽  
Jun Jie Liao ◽  
Qian Zhao ◽  
Hai Lin ◽  
Shu Wen Jiang
Keyword(s):  
Crystal Structure ◽  
Doping Concentration ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Photoluminescence Intensity ◽  
Photoluminescence Properties ◽  
White Leds ◽  
Yellow Orange ◽  
Reductive Atmosphere ◽  
Atmosphere Environment

A novel S-doped Sr3SiO5: Eu2+ phosphor was synthesized employing high temperature solid-state reaction method under reductive atmosphere environment. The crystal structure and photoluminescence properties of the phosphor, and the effect of S2- doping concentration on the photoluminescence intensity of Eu2+ was studied in details. The results show that the crystal structure of Sr3SiO5: Eu2+is not changed upon S2- doping. When the doping concentration of S2- is 1 wt%, the phosphor shows the maximum emission intensity, which is higher than that of Sr3SiO5: Eu2+ without S2-. Moreover, the addition of S2- results in an slightly shift of its emission spectra towards the red region, indicating that the S-doped Sr3SiO5: Eu2+ is an excellent yellow-orange phosphor for warm white LEDs.

Photoluminescence properties of Li2+xNb3xTi1−4xO3:Eu3+

2019 ◽  
Vol 12 (04) ◽  
pp. 1950057 ◽  
Author(s):  
Chao-Chao Guo ◽  
Qun Zeng ◽  
Chun-Feng Yao ◽  
Yan-Zhao Feng ◽  
Xi Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Red Emission ◽  
Reaction Method ◽  
X Ray ◽  
Red Phosphors ◽  
Chromaticity Coordinate

Red phosphors with compositions of Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3:3[Formula: see text]wt.% Eu[Formula: see text] [Formula: see text] were synthesized by solid-state reaction method. The samples were investigated by using X-ray diffraction (XRD) and photoluminescence spectroscopy, respectively. XRD results showed that all samples were main phase of Li2TiO3. Emission spectra of Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3:3[Formula: see text]wt.% Eu[Formula: see text] powders showed strong red emission at 612[Formula: see text]nm (5D0–7F[Formula: see text] with 396[Formula: see text]nm excitation. In addition, the excitation and emission intensity increased up to [Formula: see text], and then decreased with further increasing of the x values. And the chromaticity coordinate (CIE) of the component with [Formula: see text] was superior to other components.

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