Size dependence of quantum efficiency of red emission from GaN:Eu structures for application in micro-LEDs

2020 ◽  
Vol 45 (14) ◽  
pp. 3973 ◽  
Author(s):  
D. Denier van der Gon ◽  
D. Timmerman ◽  
Y. Matsude ◽  
S. Ichikawa ◽  
M. Ashida ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Size Dependence ◽  
Red Emission

Size dependence of photoluminescence quantum efficiency of Si nanocrystals

2006 ◽  
Vol 73 (24) ◽  
Author(s):  
Satoru Miura ◽  
Toshihiro Nakamura ◽  
Minoru Fujii ◽  
Masaki Inui ◽  
Shinji Hayashi
Keyword(s):  
Quantum Efficiency ◽  
Size Dependence ◽  
Si Nanocrystals

Luminescence properties of Mn4+ with high 2Eg level energy in the polyfluoride Na3Li3Sc2F12

2020 ◽  
Vol 49 (33) ◽  
pp. 11613-11617
Author(s):  
Hong Li ◽  
Yan Liu ◽  
Shu Tang ◽  
Lijun Luo ◽  
Qiang Zhou ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Thermal Quenching ◽  
Luminescence Properties ◽  
Level Energy ◽  
Red Emission ◽  
White Leds ◽  
Red Emitting Phosphor

Red-emitting phosphor Na3Li3Sc2F12:Mn4+ with the high 2Eg level energy shows intensive red emission accompanied with the high external quantum efficiency and thermal-quenching resistance for warm white LEDs.

Organic nanoparticles of malachite green with enhanced far-red emission: size-dependence of particle rigidity

2015 ◽  
Vol 17 (16) ◽  
pp. 11006-11013 ◽  
Author(s):  
Tomohito Funada ◽  
Takuya Hirose ◽  
Naoto Tamai ◽  
Hiroshi Yao
Keyword(s):  
Malachite Green ◽  
Size Dependence ◽  
Organic Nanoparticles ◽  
Red Emission ◽  
Size Dependent

The “rigidity” of malachite green nanoparticles is strongly size-dependent; the smaller the size is, the greater the particle rigidity inside.

Radiative quantum efficiency of CdSe/ZnS core-shell colloidal solutions: Size-dependence

2008 ◽  
Vol 281 (23) ◽  
pp. 5925-5928 ◽  
Author(s):  
Viviane Pilla ◽  
Leandro P. Alves ◽  
Marcos T.T. Pacheco ◽  
Egberto Munin
Keyword(s):  
Quantum Efficiency ◽  
Size Dependence ◽  
Core Shell ◽  
Colloidal Solutions ◽  
Radiative Quantum Efficiency

Pore size dependence of PtSi/Porous Si Schottky barrier detectors on quantum efficiency response

2012 ◽  
Vol 184 ◽  
pp. 119-123 ◽  
Author(s):  
Hamed Mehrara ◽  
Alireza Erfanian ◽  
Mahdi Khaje ◽  
Mohammad Zahedinejad ◽  
Farshid Raissi ◽  
...  
Keyword(s):  
Pore Size ◽  
Schottky Barrier ◽  
Quantum Efficiency ◽  
Size Dependence ◽  
Porous Si ◽  
Barrier Detectors

scholarly journals Blue Luminescence and Extended Red Emission: Possible Connections to the Diffuse Interstellar Bands

2013 ◽  
Vol 9 (S297) ◽  
pp. 173-179 ◽  
Author(s):  
A. N. Witt
Keyword(s):  
Quantum Efficiency ◽  
Spectral Characteristics ◽  
Emission Feature ◽  
Single Step ◽  
Blue Luminescence ◽  
Interstellar Space ◽  
H Ii Regions ◽  
High Quantum Efficiency ◽  
Red Emission ◽  
Extended Red Emission

AbstractBlue luminescence (BL) and extended red emission (ERE) are observed as diffuse, optical-wavelength emissions in interstellar space, resulting from photoluminescence by ultraviolet(UV)-illuminated interstellar grains. Faintness and the challenge of separating the BL and ERE from the frequently much brighter dust-scattered continuum present major observational hurdles, which have permitted only slow progress in testing the numerous models that have been advanced to explain these two phenomena. Both the ERE, peaking near 680 nm (FWHM ~ 60 - 120 nm) and the BL, asymmetrically peaking at ~ 378 nm (FWHM ~ 45 nm), were first discovered in the Red Rectangle nebula. Subsequently, ERE and BL have been observed in other reflection nebulae, and in the case of the ERE, in carbon-rich planetary nebulae, H II regions, high-latitude cirrus clouds, the galactic diffuse ISM, and in external galaxies. BL exhibits a close spatial and intensity correlation with emission in the aromatic emission feature at 3.3 micron, most likely arising from small, neutral polycyclic aromatic hydrocarbon (PAH) molecules. The spectral characteristics of the BL also agree with those of fluorescence by PAH molecules with 13 to 19 carbon atoms. The BL phenomenon is thus most readily understood as the optical fluorescence of small, UV-excited aromatic molecules. The ERE, by contrast, though co-existent with mid-IR PAH emissions, does not correlate with emissions from either neutral or ionized PAHs. Instead, the spatial ERE morphology appears to be strictly governed by the density of far-UV (E ≥ 10.5 eV) photons, which are required for the ERE excitation. The most restrictive observational constraint for the ERE process is its exceptionally high quantum efficiency. If the ERE results from photo-excitation of a nano-particle carrier by photons with E ≥ 10.5 eV in a single-step process, the quantum efficiency exceeds 100%. Such a process, in which one to three low-energy optical photons may be emitted following a single far-UV excitation, is possible in highly isolated small clusters, e.g. small, dehydrogenated carbon clusters with about 20 to 28 carbon atoms. A possible connection between the ERE carriers and the carriers of DIBs may exist in that both are ubiquitous throughout the diffuse interstellar medium and both have an abundance of low-lying electronic levels with E ≤ 2.3 eV above the ground state.

scholarly journals Observation of a Te4+ center with broad red emission band and high fluorescence quantum efficiency in TeO2-Li2O glass

2018 ◽  
Vol 198 ◽  
pp. 24-27 ◽  
Author(s):  
F.B. Costa ◽  
A.K.R. Souza ◽  
A.P. Langaro ◽  
J.R. Silva ◽  
F.A. Santos ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Emission Band ◽  
Red Emission ◽  
High Fluorescence

LUMINESCENT TITANIA MACROPOROUS MATERIALS DOPED WITH Eu(DBM)3⋅H2O COMPLEX

2013 ◽  
Vol 06 (06) ◽  
pp. 1350060 ◽  
Author(s):  
WEIQIANG FAN ◽  
JIAQING ZHANG ◽  
GEHONG ZHANG ◽  
HONGYE BAI ◽  
WEIDONG SHI ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Porous Structure ◽  
Quantum Efficiency ◽  
Diffuse Reflectance ◽  
Desorption Isotherm ◽  
Red Emission ◽  
Macroporous Materials ◽  
Ft Ir ◽  
Adsorption Desorption ◽  
The Eu

Visible luminescent hybrid titania macroporous materials doped with Eu ( DBM )3⋅ H 2 O complex ( Eu ( DBM )3⋅ H 2 O / TiO 2- M , M = macroporous, DBM = dibenzoylmethanate) were synthesized with poly(methyl methacrylate) nanospheres (PMMAs) as templates. The obtained Eu ( DBM )3⋅ H 2 O / TiO 2- M exhibit close-packed spherical porous structure and characteristic red emission of the Eu 3+ ion. Moreover, diffuse reflectance (DR) and photoluminescence (PL) spectra suggest that the Eu ( DBM )3⋅ H 2 O complex were successfully doped into the macroporous titania matrix. The FT-IR, luminescent lifetimes, N 2 adsorption-desorption isotherm, and emission quantum efficiency were further investigated.

Red Phosphorescent Platinum(II) Complexes with Tetradentate Pyridine-Containing Ligands for Organic Light Emitting Diodes

2020 ◽  
Vol 20 (11) ◽  
pp. 6669-6674
Author(s):  
Jeongkyu Woo ◽  
Soo Kyung Kang ◽  
Ju Hee Han ◽  
Ki Ju Kim ◽  
Yu Ji Moon ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Luminous Efficiency ◽  
Organic Light Emitting Diodes ◽  
Red Emission ◽  
Light Emitting ◽  
Organic Light ◽  
20 Nm

Here, red phosphorescent platinum(II) complexes based on tetradentate pyridine-containing lig-ands are studied. To investigate their electroluminescent properties, multilayer devices were fabricated in the following sequence; ITO (180 nm)/4,4′,4″-Tris[2-naphthyl(phenyl)amino]triphenylamine (2-TNATA) (30 nm)/N, N′-di(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl)4,4′-diamine (NPB) (20 nm)/ Tris(4-carbazoyl-9-ylphenyl)amine (TCTA) (10 nm)/4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP) (20 nm)/Platinum(II) complex (20 nm)/1,3,5-Tris(1-Phenyl-1H-benzimidazol-2-yl)benzene) (TPBi) (40 nm)/Liq (2 nm)/Al (100 nm). In particularly, a device using platinum(II) complex based on N-(3,5-di-tert-butylphenyl)-3-(pyridin-2-yl)-N-(3-(pyridin-2-yl)phenyl)benzenamineligand showed the efficient red emission, with a luminous efficiency, power efficiency, and external quantum efficiency of, and the Commission International de LEclairge (CIE) coordinates of 27.26 cd/A, 10.54 lm/W, 8.50% at 20 mA/cm2, and (0.65, 0.33) at 11.0 V, respectively.

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