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.

Synthesis and Luminescent Properties of Red Phosphor BaY2O4: Eu3+ for White Light-Emitting Diodes

2013 ◽  
Vol 811 ◽  
pp. 181-185 ◽  
Author(s):  
Lan Tu Ya Wu
Keyword(s):  
Sol Gel ◽  
Red Light ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Electric Dipole Transition ◽  
Excitation Spectra ◽  
Excitation Peak ◽  
Red Phosphor ◽  
Light Emitting ◽  
White Light Emitting Diodes

The rare-earth Eu3+doped BaY2O4red phosphor synthesized by citric acid sol-gel method. The structure, morphology and composition of the red phosphor were characterized by X-ray diffraction, scanning electron microscopy and infrared spectroscopy. The results show that the distribution of the pure phase BaY2O4: Eu3+particles after annealing at 800 °C was irregular, small size of particle is 0.2 μm to 0.4 μm. The excitation spectra of synthesized phosphor at 610 nm monitoring were composed of a broadband and a series of sharp peaks, the strongest excitation peak at 466 nm, the secondly at 395nm. It was indicated that BaY2O4: Eu3+phosphor matching with the widespread applied the output wavelengths of UV LED and blue LED chips. The main emission spectra of samples under blue light excitation is Eu3+ions5D07F2electric dipole transition with a strong red light, so that the BaY2O: Eu3+phosphor may be a better candidate for red component for white LED.

A novel orange-red phosphor Ca3B2O6:Sm3+, A+(A = Li, Na, K) for white light emitting diodes

2014 ◽  
Vol 07 (03) ◽  
pp. 1450033 ◽  
Author(s):  
Qingbo Liu ◽  
Yufeng Liu ◽  
Fu Yang ◽  
Bing Han ◽  
Hao Feng ◽  
...  
Keyword(s):  
Emission Spectrum ◽  
Integral Intensity ◽  
Red Light ◽  
Red Phosphor ◽  
Light Emitting ◽  
Red Phosphors ◽  
Near Ultraviolet ◽  
Bright Orange ◽  
Cie Chromaticity ◽  
White Light Emitting Diodes

A novel orange-red phosphor Ca 3 B 2 O 6: Sm 3+, A+( A = Li , Na , K ) has been synthesized by solid-state reaction at 950°C. The phase purity and photoluminescence (PL) behavior of the phosphor are studied in detail using the powder X-ray diffraction (XRD) technique and PL measurements. Ca 3 B 2 O 6: Sm 3+ phosphor can be efficiently excited by near ultraviolet (n-UV) and blue light, and the emission spectrum consists of four emission peaks at 563, 599, 646 and 709 nm, generating bright orange-red light. When a cation A+ is introduced into Ca 3 B 2 O 6: Sm 3+ as charge compensator, the emission intensity of Ca 3 B 2 O 6: Sm 3+ is evidently enhanced, but the PL spectral profile is unchanged. The integral intensity of the emission spectrum of Ca 2.96 Sm 0.02 Na 0.02 B 2 O 6 excited at 401 nm is about 1.2 times than that of Y 2 O 2 S : Eu 3+ commercial red phosphor. The CIE chromaticity coordinates of Ca 2.96 Sm 0.02 Na 0.02 B 2 O 6 phosphor were (0.608, 0.365), which are close to that of the commercial red phosphors Y 2 O 3: Eu 3+ (0.655, 0.345), Y 2 O 2 S : Eu 3+ (0.622, 0.351) and Sr 2 Si 5 N 8: Eu 2+ (0.620, 0.370).

scholarly journals Sr2−xBaxTiO4:Eu3+, Gd3+: A Novel Blue Converting Yellow-Emitting Phosphor for White Light-Emitting Diodes

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Limin Dong ◽  
Jiatong Zhao ◽  
Qin Li ◽  
Zhidong Han
Keyword(s):  
Blue Light ◽  
White Light ◽  
Single Phase ◽  
Light Emission ◽  
Light Emitting Diode ◽  
Sol Gel ◽  
Excitation Wavelength ◽  
Light Emitting ◽  
Gel Method ◽  
White Light Emitting Diodes

A highly intense yellow-emitting phosphorSr2-xBaxTiO4:Eu3+,Gd3+peaking at 593–611 nm was synthesized by the sol-gel method. XRD and SEM show that the samples are single phase and have irregular shape. The excitation wavelength matches well with that of the emission of the blue-light-emitting diode. The emission peaks at 593 and 611 nm are attributed to the transitions from the5D0-7F1and5D0-7F2ofEu3+ions, respectively.Gd3+was used as sensitizer, aiming at increasing the luminous intensity. A certain amount ofSr2+andBa2+is contributed to the intensity of light emission.

Intense Red Light Emission of Eu3+-Doped Sr3B2SiO8for White Light-Emitting Diodes

2012 ◽  
Vol 159 (4) ◽  
pp. J107-J114 ◽  
Author(s):  
Jianfeng Sun ◽  
Wenlin Zhang ◽  
Dezhong Shen ◽  
Jiayue Sun
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
Red Light ◽  
Light Emitting ◽  
White Light Emitting Diodes

scholarly journals Improvement in Durability of Red Phosphor Encapsulated by Sol-Gel Glass for Use in White Light-Emitting Diodes

2009 ◽  
Vol 33 (2) ◽  
pp. 82-87 ◽  
Author(s):  
Eimo KIN ◽  
Takeshi FUKUDA ◽  
Norihiko KAMATA ◽  
Hidehiko OHARA ◽  
Toshiaki YOKOO ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Sol Gel ◽  
Red Phosphor ◽  
Light Emitting ◽  
White Light Emitting Diodes

A novel near-ultraviolet-light excitable Eu3+-doped Sr2LaTaO6 red phosphor for white-light-emitting diodes

Optik ◽  
2021 ◽  
Vol 240 ◽  
pp. 166908
Author(s):  
Qifeng Tang ◽  
Tao Yang ◽  
Haifeng Huang ◽  
Jinqing Ao ◽  
Biyou Peng ◽  
...  
Keyword(s):  
Ultraviolet Light ◽  
White Light ◽  
Light Emitting Diodes ◽  
Red Phosphor ◽  
Light Emitting ◽  
Near Ultraviolet ◽  
White Light Emitting Diodes

Effects of electron-withdrawing groups in imidazole-phenanthroline ligands and their influence on the photophysical properties of EuIII complexes for white light-emitting diodes

2017 ◽  
Vol 41 (18) ◽  
pp. 9826-9839 ◽  
Author(s):  
Boddula Rajamouli ◽  
Rachna Devi ◽  
Abhijeet Mohanty ◽  
Venkata Krishnan ◽  
Sivakumar Vaidyanathan
Keyword(s):  
Thin Film ◽  
Quantum Yield ◽  
White Light ◽  
Light Emitting Diode ◽  
Photophysical Properties ◽  
Red Light ◽  
Europium Complexes ◽  
Light Emitting ◽  
White Light Emitting Diodes ◽  
Phenanthroline Ligands

The red light emitting diode (LED) was fabricated by using europium complexes with InGaN LED (395 nm) and shown digital images, corresponding CIE color coordinates (red region) as well as obtained highest quantum yield of the thin film (78.7%).

(K0.5Na0.5)NbO3:Eu3+/Bi3+: a novel, highly efficient, red light-emitting material with superior water resistance behavior

RSC Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 4707-4715 ◽  
Author(s):  
Qiwei Zhang ◽  
Haiqin Sun ◽  
Tao Kuang ◽  
Ruiguang Xing ◽  
Xihong Hao
Keyword(s):  
Blue Light ◽  
White Light ◽  
High Performance ◽  
Water Resistance ◽  
Light Emitting Diodes ◽  
Red Light ◽  
Light Emitting ◽  
Highly Efficient ◽  
White Light Emitting Diodes

Materials emitting red light (∼611 nm) under excitation with blue light (440–470 nm) are highly desired for fabricating high-performance white light-emitting diodes (LEDs).

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