Red luminescence and ferromagnetism in europium oxynitridosilicates with a β-K2SO4 structure

2015 ◽  
Vol 51 (11) ◽  
pp. 2166-2169 ◽  
Author(s):  
Ashley P. Black ◽  
Kristin A. Denault ◽  
Judith Oró-Solé ◽  
Alejandro R. Goñi ◽  
Amparo Fuertes
Keyword(s):  
Curie Temperature ◽  
Alkaline Earth ◽  
Phosphor Material ◽  
Red Phosphor ◽  
Analogous Compound ◽  
Red Luminescence ◽  
Orange Luminescence

LaSrSiO3N and LaBaSiO3N are the first examples of nitride-based alkaline earth orthosilicates with β-K2SO4 structure, and they show red-orange luminescence after activation with Eu2+. The analogous compound LaEuSiO3N is, in addition to a red phosphor material, a soft ferromagnet with a Curie temperature of 3 K.

Studies of defects in YVO4:Pb2+, Eu3+ red phosphor material

2003 ◽  
Vol 198 (2) ◽  
pp. 447-456 ◽  
Author(s):  
F. M. Nirwan ◽  
T. K. Gundu Rao ◽  
P. K. Gupta ◽  
R. B. Pode
Keyword(s):  
Phosphor Material ◽  
Red Phosphor

Sensitized red luminescence from Ce3+, Mn2+-doped glaserite-type alkaline-earth silicates

2010 ◽  
Vol 183 (6) ◽  
pp. 1303-1308 ◽  
Author(s):  
Yoshinori Yonesaki ◽  
Takahiro Takei ◽  
Nobuhiro Kumada ◽  
Nobukazu Kinomura
Keyword(s):  
Alkaline Earth ◽  
Red Luminescence ◽  
Alkaline Earth Silicates

Synthesis and Photoluminescence Properties of the Novel Red Phosphor Gd2MoB2O9: Eu

2011 ◽  
Vol 311-313 ◽  
pp. 1327-1331 ◽  
Author(s):  
Ling He ◽  
Wei Min Sun ◽  
Yu Tian Ding ◽  
Yu Hua Wang
Keyword(s):  
Solid State ◽  
Broad Band ◽  
Emission Peak ◽  
The Novel ◽  
Excitation Band ◽  
Photoluminescence Properties ◽  
Red Phosphor ◽  
Red Emission ◽  
Main Emission Peak ◽  
Red Luminescence

A novel phosphor, Gd2MoB2O9:Eu3+ has been synthesized by solid-state reaction and its photoluminescence in UV-VUV range are investigated. A sharp excitation band is observed in the region of 120–135 nm, which is related to the charge-transfer (CT) band of Gd3+. The broad band around 135–160 nm can be assigned to the BO3 host absorption. The broad bands around 248 nm are assigned to the CT band of Eu3+-O2-. The phosphors emit strong red luminescence centered at about 591 nm, 614 nm and 626 nm due to the5D0–7F1 and 5D0–7F2 transitions of Eu3+. The main emission peak under 254 and 147 nm excitations also shows different shifts with increasing Eu3+ concentration. This could be due to the different luminescence sites selected at high doping concentrations of Eu3+. Gd2MoB2O9:Eu3+ shows the pure red emission under both 254 and 147 nm excitations.

Controllable site occupation of Eu in intricate superstructure of perovskite Sr3Al2O6: Eu, Dy, Li to produce red luminescence

2018 ◽  
Vol 11 (01) ◽  
pp. 1850012 ◽  
Author(s):  
Mei Zhu ◽  
Yunfei Tian ◽  
Jie Chen ◽  
Mi Fei ◽  
Liangrui He ◽  
...  
Keyword(s):  
Light Emission ◽  
Sol Gel ◽  
Red Light ◽  
Manufacturing Cost ◽  
Red Phosphor ◽  
Light Emitting ◽  
Site Occupation ◽  
Co Doping ◽  
Red Luminescence ◽  
White Light Emitting Diodes

An oxide red phosphor, with outstanding superiority in manufacturing cost, is particular desired for white light-emitting diodes (LEDs). In this work, a strategy to controllable site occupation of Eu in Sr3Al2O6 to give red light emission was employed with a three-step route: the combustion of sol–gel to prepare superfine precursor, the solid-sate reaction of precursor to incorporate Eu into small voids, and a second reduction in 25%H[Formula: see text]75%N2 atmosphere. Accordingly, a new red phosphor of Sr3Al2O6:Eu,Dy,Li was developed. The results shows the red luminescence of Sr3Al2O6:Eu could be improved by doping Dy[Formula: see text] and be further improved by co-doping Li[Formula: see text]. The red luminescence involves the [Formula: see text]-[Formula: see text] transition of Eu[Formula: see text] and the auto-ionization of electron from Eu[Formula: see text] to conduction band. Dy[Formula: see text] acts as a trap center of the thermally released electrons then with electrons returned to the 4[Formula: see text] ground state of Eu[Formula: see text], red light was emitted. The co-substitution of Sr[Formula: see text]–Sr[Formula: see text] by Dy[Formula: see text]–Li[Formula: see text] is helpful to balance defects and improve crystallization.

A novel red phosphor of Mn4+ion-doped oxyfluoroniobate BaNbOF5for warm WLED applications

CrystEngComm ◽  
2018 ◽  
Vol 20 (37) ◽  
pp. 5641-5646 ◽  
Author(s):  
Xinlong Dong ◽  
Yuexiao Pan ◽  
Dong Li ◽  
Hongzhou Lian ◽  
Jun Lin
Keyword(s):  
Blue Light ◽  
Room Temperature ◽  
Prepared Phosphor ◽  
Color Purity ◽  
Red Phosphor ◽  
Light Region ◽  
Intense Absorption ◽  
Red Luminescence

A novel red phosphor composed of Mn4+-activated oxyfluoroniobate BaNbOF5was obtained at room temperature in air. The as-prepared phosphor showed a broad and intense absorption in the blue-light region and a bright red luminescence with a color purity of 97.7%.

scholarly journals Synthesis and Luminescence Properties of SrGd2O4:Eu3+ Red Phosphors

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Jun-Feng Wang ◽  
Hao Zu ◽  
Chuan-Wen Lin ◽  
Shou-Jun Ding ◽  
Peng-Yu Shao ◽  
...  
Keyword(s):  
Solid Phase ◽  
Raw Materials ◽  
Red Light ◽  
Luminescence Properties ◽  
Phase Method ◽  
Excitation Spectra ◽  
Phosphor Material ◽  
Red Phosphor ◽  
Red Phosphors ◽  
Near Ultraviolet

As one of the important raw materials for LED products, phosphors play an important role. At present, the spectrum of LED phosphors lacks red light, resulting in poor quality of white LED products and a low color rendering index (Ra <80), which affects lighting effects. To solve this problem, we synthesized the SrGd2O4:Eu3+ red phosphor by a high-temperature solid-phase method. The structure and luminescence properties of SrGd2O4:Eu3+ red phosphors were studied by means of X-ray diffraction (XRD) measurements of their emission and excitation spectra, and their spectra were analyzed. We also studied the Eu3+ doping concentration with the best luminous efficiency and the color coordinate of the SrGd2O4:Eu3+ phosphor. The experimental results show that SrGd2O4:Eu3+ is a new red phosphor material that can be used for near-ultraviolet or blue-light excitation and has good practicability.

scholarly journals K2SnOF4 and K2WO3F2 – different but similar

2020 ◽  
Vol 75 (9-10) ◽  
pp. 833-841
Author(s):  
Christiane Stoll ◽  
Markus Seibald ◽  
Dominik Baumann ◽  
Hubert Huppertz
Keyword(s):  
Luminescence Spectroscopy ◽  
X Ray Diffraction ◽  
Orthorhombic Crystal ◽  
Phosphor Material ◽  
Red Phosphor ◽  
X Ray ◽  
High Pressure High Temperature ◽  
Ft Ir ◽  
Ft Ir Spectroscopy ◽  
Single Crystal Analysis

AbstractK2SnOF4 and K2WO3F2 were synthesized via a high-pressure/high-temperature route. Single-crystal analysis showed that both substances crystallize in the orthorhombic crystal system with space group Pnma and are isostructural to each other. The main motifs of the structures are octahedral [SnO2F4]4− and [WO4F2]4− entities for K2SnOF4 and K2WO3F2, respectively. Within the structures, these units are connected to quasi-isolated infinite chains. The substances were further characterized via powder X-ray diffraction, EDX and FT-IR spectroscopy. Doping of K2SnOF4 with Mn4+ yielded a red phosphor material which was analyzed by luminescence spectroscopy. The emission maximum is located at λmax = 631 nm.

ChemInform Abstract: Sensitized Red Luminescence from Ce3+, Mn2+-Doped Glaserite-Type Alkaline-Earth Silicates.

ChemInform ◽  
2010 ◽  
Vol 41 (35) ◽  
pp. no-no
Author(s):  
Yoshinori Yonesaki ◽  
Takahiro Takei ◽  
Nobuhiro Kumada ◽  
Nobukazu Kinomura
Keyword(s):  
Alkaline Earth ◽  
Red Luminescence ◽  
Alkaline Earth Silicates

Luminescence Properties of Novel Red Phosphor NaSrPO4:Eu3+

2012 ◽  
Vol 502 ◽  
pp. 128-131 ◽  
Author(s):  
Jia Yue Sun ◽  
Xiang Yan Zhang ◽  
Ji Cheng Zhu ◽  
Yi Ning Sun ◽  
Hai Yan Du
Keyword(s):  
Solid State ◽  
White Light ◽  
Dipole Transition ◽  
Luminescence Properties ◽  
Excitation Wavelength ◽  
Conventional Solid State Reaction ◽  
Red Phosphor ◽  
Uv Led ◽  
Red Luminescence ◽  
Uv Excitation

A novel red-emitting NaSrPO4:Eu3+ phosphor was prepared by a conventional solid-state reaction. The luminescence properties and temperature dependence of 4:Eu3+ were investigated. The phosphor exhibited red luminescence under the near-UV excitation of 395 nm, corresponding to the 5F0→7L6 transition of Eu3+ ions, which matched well with the excitation wavelength of near-UV LED chips. The electronic transition due to 5D0→7F2 transition of Eu3+ ions is stronger than the magnetic dipole transition due to 5D0→7F1 of Eu3+ ions. Furthermore, Eu3+-doped NaSrPO4 phosphor shows higher thermally stable luminescence comparable tocommercially available Y3Al5O12:Ce3+ phosphor. All the investigated suggested that this newly developed phosphor could find applications in white light devise utilizing InGaN-based excitation in the near-UV chips.

scholarly journals Luminescence properties of Mn4+-doped CaAl2O4as a red emitting phosphor for white LEDs

2021 ◽  
Vol 63 (3) ◽  
pp. 3-7
Author(s):  
Thi Kim Chi Nguyen ◽  
◽  
Duy Hung Nguyen ◽  
Tan Vinh Le ◽  
Thanh Vu Tran ◽  
...  
Keyword(s):  
Great Promise ◽  
White Led ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
White Leds ◽  
Broadband Emission ◽  
Structure Morphology ◽  
Red Luminescence ◽  
Co Precipitation ◽  
Red Emitting Phosphor

A series of Mn4+-activated CaAl2O4 (CAO) compounds were synthesized by co-precipitation to seek a candidate for a red-emitting phosphor to be employed in a white LED. The crystal structure, morphology, and fluorescence properties of the as-obtained phosphors were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL). The deep red luminescence of Mn4+ in CaAl2O4 is reported and discussed. The excitation spectrum exhibited broadband emission between 260 and 550 nm with three peaks dominating at 320 nm due to the transition of 4A24T1. Theemission spectra between 600 to 720 nm displays an overwhelming emission peak at 654 nm owing to the 2E4A2 transition of Mn4+ ion.This research demonstrates the great promise of CaAl2O4:Mn4+ as a commercial red phosphor in warm white LEDs and opens up new avenues for the exploration of novel non-rare-earth red-emitting phosphors.

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