α-M3B2N4 (M = Ca, Sr):Eu3+: A Nitride-based Red Phosphor with a Sharp Emission Line and Broad Excitation Band Used for WLED

2017 ◽  
Vol 121 (18) ◽  
pp. 10102-10111 ◽  
Author(s):  
Jianyan Ding ◽  
Quansheng Wu ◽  
Yanyan Li ◽  
Qiang Long ◽  
Yichao Wang ◽  
...  
Keyword(s):  
Emission Line ◽  
Excitation Band ◽  
Broad Excitation Band ◽  
Red Phosphor ◽  
Sharp Emission Line

Co-precipitation synthesis and photoluminescence properties of BaTiF6:Mn4+: an efficient red phosphor for warm white LEDs

2018 ◽  
Vol 6 (1) ◽  
pp. 127-133 ◽  
Author(s):  
Yong Liu ◽  
Guojun Gao ◽  
Lin Huang ◽  
Yiwen Zhu ◽  
Xuejie Zhang ◽  
...  
Keyword(s):  
Emission Line ◽  
Photoluminescence Properties ◽  
Broad Absorption ◽  
Red Phosphor ◽  
White Leds ◽  
Blue Region ◽  
Precipitation Synthesis ◽  
Co Precipitation ◽  
Sharp Emission Line

BaTiF6:Mn4+: a fluoride-based red phosphor with a sharp emission line and broad absorption in the blue region used for warm WLEDs.

A novel red emitting phosphor LiBaB9 O15 :Sm2+ /Sm3+ , li+ with broad excitation band for white LEDs

Luminescence ◽  
2018 ◽  
Vol 33 (2) ◽  
pp. 438-442 ◽  
Author(s):  
Ting Li ◽  
Zhijun Wang ◽  
Panlai Li ◽  
Shuchao Xu ◽  
Qiongyu Bai ◽  
...  
Keyword(s):  
Excitation Band ◽  
Broad Excitation Band ◽  
White Leds ◽  
Red Emitting Phosphor

The development of silicate matrix phosphors with broad excitation band for phosphor-convered white LED

2008 ◽  
Vol 53 (19) ◽  
pp. 2923-2930 ◽  
Author(s):  
XiXian Luo ◽  
WangHe Cao ◽  
Fei Sun
Keyword(s):  
White Led ◽  
Excitation Band ◽  
Silicate Matrix ◽  
Broad Excitation Band

Citric Acid Complex Sol-Gel Method to Prepare Lu2SiO5:Eu Phosphor

2017 ◽  
Vol 893 ◽  
pp. 122-126
Author(s):  
Yi Yang ◽  
Lei Yang ◽  
Yan Lin Chen ◽  
Ming Yan
Keyword(s):  
Photoluminescence Spectrum ◽  
Sol Gel ◽  
Emission Peak ◽  
Excitation Band ◽  
Dsc Analysis ◽  
Scanning Calorimetry ◽  
Broad Excitation Band ◽  
Acid Complex ◽  
X Ray ◽  
Enthalpy Changes

The Lu2SiO5 dried gel was prepared by the sol-gel reaction followed by a 24h drying at 90°C.The thermogravimetry–differential scanning calorimetry (TG-DSC) analysis curves of the dried gel demonstrates mass and enthalpy changes as temperature raised.The obtained dried gel was calcined at 900°C,1000°C,1100°Cand1200°C each for 2h to prepare polycrystalline Eu3+-dropped Lu2SiO5 phosphor.The phase composition and crystal structure was identified with an X-ray diffractometer (XRD).The dried gel was crystallized into A-type LSO phase at 1000°C, and transferred to B-type LSO phase when temperature was raised above 1050°C.The obtained LSO grain size is 200-300nm revealed in Field-emission scanning electron microscopy (FE-SEM) images.The photoluminescence spectrum of the obtained 2mol% Eu3+-dropped Lu2SiO5 phosphor showed a broad excitation band around 263nm and a sharp emission peak at 613nm.

TWO-STEP ELECTRON BEAM EXCITATION OF Al2O3:Cr BY GALLIUM NITRIDE RECOMBINATION RADIATION

2001 ◽  
Vol 15 (17n19) ◽  
pp. 787-791
Author(s):  
A. ZEHE ◽  
A. RAMÍrez ◽  
W. SEIFERT
Keyword(s):  
Electron Beam ◽  
Emission Line ◽  
Red Light ◽  
Radiation Emission ◽  
Electrical Insulator ◽  
Practical Applications ◽  
Electron Beam Excitation ◽  
Epitaxial Deposition ◽  
Sharp Emission Line ◽  
Beam Excitation

We report on a two-step excitation process of a GaN/A 2 O 3: Cr specimen by an external electron beam of 30 keV. The epitaxial growth of GaN on the (0001) faces of ruby is described, as well as the experimental technique applied in the excitation and recording of the combined luminescence spectrum. It is known that the spinel and ruby are frequently used as substrate materials for the epitaxial deposition of GaN. At the same time is ruby one of the most useful layer materials with a red emission line λ = 694 nm. Due to its dielectric character, the pumping of ruby is performed usually subjecting it to the light of an intense flash lamp. Electron beam excitation, on the other hand, which could be more powerful, is impaired with electrical insulator material. This discrepancy can be removed by a two-step excitation, where at first the semiconducting GaN-layer, epitaxially grown on a (0001)Al 2 O 3: Cr (ruby) crystal is excited to radiation emission by an external electron beam. The following internal absolption process, by the ruby crystal, of the GaN luminescence radiation provides for the characteristic 2 E to 4 A 2-transition at 1.786 eV. We found a strong and sharp emission line of that photon energy, which additionally displays polarization, typical for the anisotropic uniaxial ruby crystal. Such an indirect electron-beam excitation of ruby allows to generate almost monochromatic red light, and might point into a direction of interesting practical applications.

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.

Effects of Ti4+ Ions on Fluorescence Properties of Sr2CeO4:Sm3+ Phosphors

2016 ◽  
Vol 16 (4) ◽  
pp. 3998-4002 ◽  
Author(s):  
Haiyan Jiao ◽  
Peiyu Wang ◽  
Liwei Liu ◽  
Yuhua Wang
Keyword(s):  
Single Phase ◽  
Charge Transfer Band ◽  
Solid State Reaction Method ◽  
Excitation Band ◽  
Photoluminescence Properties ◽  
Broad Excitation Band ◽  
Light Emitting ◽  
Chromaticity Coordinate ◽  
White Light Emitting Diodes ◽  
Excellent Color

Ti4+-doped Sr2CeO4:Sm3+ phosphors were synthesized with the solid-state reaction method and the effects of doping Ti4+ on the photoluminescence properties were investigated in detail. A broad excitation band ascribed to the O2-–Ce4+ transition was observed in the range of 200 to 400 nm and with doping Ti4+ into Ce4+ sites, the intensity of charge transfer band of O2- →Ce4+ (300–370 nm) was significantly broaden and enhanced. As a result, the emission intensity of Sr2Ce1−xTixO4 has improved about 85% by doping 0.01 mol Ti4+. White emission of −Sr2-yCe0.99Ti0.01O4:ySm3+ at y ≤ 0.03 is due the co-existence of Ce4+ → O2- CT emission and 4G5/2–6HJ Sm3+ transitions whereas only the Sm3+ red emission prevails for 003<y≤0.15. The Sr1.99Ce0.99Ti0.01O4:0.01Sm3+ phosphor exhibited excellent color purity. Its chromaticity coordinate is measured to be (0.326, 0.322), which is close to the pure white (0.33, 0.33). The results showed that Sr1.99Ce0.99Ti0.01O4: 0.01Sm3+ phosphors could be considered as a potential single-phase white-emitting phosphor for white light-emitting diodes.

Luminescent Properties of Re2SiO4:Tm3+ (Re=Mg,Ba,Sr) Under VUV

2008 ◽  
Vol 368-372 ◽  
pp. 372-374
Author(s):  
Peng Zhi Lu ◽  
Da Wei He ◽  
Xin Li ◽  
Yong Sheng Wang
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Powder Diffraction ◽  
Luminescent Properties ◽  
Host Lattice ◽  
Excitation Band ◽  
Excitation Spectra ◽  
Broad Excitation Band ◽  
X Ray ◽  
Charge Transfer Transitions

New phosphors of Tm3+ doped Re2SiO4 (Re=Mg, Ba, Sr) were prepared by the solid-state reaction and their luminescent properties were investigated. X-ray powder diffraction analysis confirmed the formation of Re2SiO4: Tm3+ (Re=Mg, Ba, Sr). The excitation spectra indicated that this phosphor can be effectively excited by 161nm. It consists of peaked at 175nm and a broad excitation band from 184nm to 300nm, corresponded to the absorption of the host lattice and the O−Tm3+ charge transfer transitions. The emission peaks at about 357nm, 459nm, 485nm is separately corresponds to the 1D2 → 3H6, 1D2 → 3H4, 1G4 → 3H6 transitions of Tm3+. As the radius of alkali earth ion in Re site increases, the main emission peaks changed to 478nm from 459nm.

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