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    Wyświetlanie 1-13 z 13
    Tytuł:
    Highly Efficient Blue LECs Using Charged Iridium Complexes
    Autorzy:
    Wongkhan, K.
    Mahanitipong, U.
    Srikaew, M.
    Tantirunggrotchai, Y.
    Sahasithiwat, S.
    Jitchati, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401295.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.60.Bt
    85.60.Jb
    Opis:
    Two heteroleptic charged iridium (III) species comprising two cyclometallating ligands and a neutral diimine ligand were synthesized and characterized, namely [(3,4,7,8-tetramethyl-1,10-phenanthroline-N-N')-bis-(2-(2,4-difluorophenyl)-5-(trifluoromethyl)pyridine-$C^{6'}$,N)-iridium (III)]hexafluorophosphate (UM01) and [(3,4,7,8-tetramethyl-1,10-phenanthroline-N-N')-bis-(2-(2',4'-difluoro-phenyl)-1H-pyrazole-C^{6'},N)-iridium (III)]hexafluorophosphate (UM02). Both complexes were used as the blue emitter in OLED and LEC devices. We found that the optimized structure is ITO/PEDOT:PSS/complex:BMIMPF₆(1:1)/Al. The UM01 gave a current efficiency of 1.14 cd $A^{-1}$, whereas the UM02 shows a better CIE coordination at 0.19, 0.40.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1109-1111
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LED Board Error Detection Automation with Image Processing
    Autorzy:
    Üncü, İ.
    Coşkunsu, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402520.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.60.Jb
    88.05.Tg
    Opis:
    Nowadays, a great part of energy consumption belongs to lighting products. For this reason, lighting fixtures that consume less energy but perform more efficiently are manufactured. LEDs are the latest product of this development. LEDs have advantages over traditional lighting systems, such as being efficient, long lasting and environment friendly. Recently, with the development of technology, the image processing techniques are used in various fields. Image processing-based fault detection systems have become a frequently referenced solution in industrial automation systems due to the rapid analysis ability and high level of accuracy. Along with the use of cameras in the photometric measurements, it has become possible to make multiple measurements on the same photograph. In this study, control automation has been developed to determine the photometric properties in LED boards, used in the production of LED lighting fixtures. Improper LEDs are detected by checking colour and brightness of all LEDs on the LED board by means of a computer-controlled system.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-471-B-473
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure and Temperature Dependence of Threshold Current in Semiconductor Lasers Based on InGaAs/GaAs Quantum-Well Systems
    Autorzy:
    Maziarz, M.
    Piechal, B.
    Bercha, A.
    Bohdan, R.
    Trzeciakowski, W.
    Majewski, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047719.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    85.60.Jb
    Opis:
    In the present paper we demonstrate that wide-range wavelength tuning of semiconductor lasers can be achieved by applying high pressure and low temperature. We report the experimentally measured dependence of the threshold current and emission energy on pressure and temperature in InGaAs/GaAs quantum-well lasers and provide the simple theoretical explanation of the physics behind the experimental findings.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 437-442
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of the Duty Factor οf Semiconductor Light Sources Used in Photoacoustics
    Autorzy:
    Starecki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811560.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.38.Zp
    85.60.Jb
    Opis:
    There are two most common approaches to the light intensity modulation that can be found in the papers describing photoacoustic experiments. In the first one, photoacoustic signal is produced by short light pulses of relatively high power, obtained usually from pulse mode lasers. In the other, the light intensity is square or sine modulated with the duty factor of approximately 50%. However, in the case of semiconductor light sources, like LED or laser diodes, it should be taken into account that duty factor of the modulation signal can be (at least in some range) exchanged with the optical output power. The paper presents discussion of the problem, including simplified theoretical analysis and experimental results. The analysis shows that in some cases, if the duty factor of a LED diode is optimized toward maximum amplitude of the induced photoacoustic signal, the resulting signal gain can be greater than 50%. Optimal duty factor depends on characteristics of the particular light source, but at least in the case of LED diodes it will be usually less than the typically used 50%.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-205-A-210
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wide Range Wavelength Tuning of InGaAsP/InP Laser Diodes
    Autorzy:
    Bajda, M.
    Trzeciakowski, W.
    Majewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492843.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    85.60.Jb
    Opis:
    We present results of theoretical studies of external tuning for laser diodes based on InGaAsP/InP heterostructures at temperatures from 300 K down to 80 K and at hydrostatic pressures up to 2.27 GPa. The tuning range achieved by pressure and grating was 390 nm (from 1220 nm to 1610 nm). At lower temperatures the tuning range achieved with grating was significantly reduced. Our results indicate that pressure tuning is much more effective than temperature tuning when combined with tuning by external grating.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 852-855
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Threshold Room Temperature AlGaAs/GaAs GRIN SCH SQW Lasers Grown by MBE
    Autorzy:
    Kaniewska, M.
    Regiński, K.
    Muszalski, J.
    Kryńska, D.
    Litkowiec, A.
    Kaniewski, J.
    Wesołowski, M.
    Bugajski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1951031.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.De
    85.60.Jb
    73.20.Dx
    Opis:
    Low threshold room temperature AlGaAs/GaAs graded-index separate-confinement heterostructure single quantum well (GRIN SCH SQW) lasers were prepared by MBE. The influence of the growth temperature on the laser parameters was studied. Due to the high temperature MBE growth and the use of p-contact layer in the form of thin quasi-metallic beryllium layer significant reduction of the threshold current was achieved.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 847-850
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interplay between Internal and External Electric Field Studied by Photoluminescence in InGaN/GaN Light Emitting Diodes
    Autorzy:
    Staszczak, G.
    Khachapuridze, A.
    Grzanka, S.
    Czernecki, R.
    Piotrzkowski, R.
    Perlin, P.
    Suski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492901.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.Fi
    78.67.De
    85.60.Bt
    85.60.Jb
    Opis:
    We have studied a series of polar InGaN/GaN light emitting diodes, consisting of either a blue (440-450 nm) quantum well, or combination of blue and violet (410 nm) quantum wells (with indium content 18% and 10%, respectively). The blue quantum well was always placed close to p-type region of the particular LED. We found that the electroluminescence induced by low current is characterized by light emission from the blue quantum well only. In comparison, optical excitation of our LEDs leads to light emission with energies characteristic either for blue and/or violet quantum wells. The corresponding microphotoluminescence spectra evolve depending on external polarization and variable light intensity of excitation supplied by He-Cd laser. Interplay between built-in electric field and externally applied polarization/screening decides about the band structure profiles and thus radiative recombination mechanisms.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 891-893
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porous Silicon Avalanche LEDs and their Applications in Optoelectronics and Information Displays
    Autorzy:
    Jaguiro, P.
    Katsuba, P.
    Lazarouk, S.
    Smirnov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047875.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Mb
    78.60.Fi
    85.60.Jb
    85.60.Pg
    Opis:
    The use of silicon based light emitting diodes may completely solve the problem of low compatibility of optoelectronics elements and silicon chip. At present time the most suitable kinds of Si-LEDs are monocrystal and porous silicon avalanche LEDs. They have advantages such as long operation lifetime (>10000 hours), continuous spectrum, which allows to filter RGB colors, operation voltages (<12 V), extremely sharp voltage-current characteristic, nanosecond response time, and high high operation current densities (up to 8000 A/cm$\text{}^{2}$ in pulse mode). Rather low energy efficiency (<1%) is not so significant for near to eyes (NTE) microdisplays. These advantages open a way to design a high performance and cost effective passive addressed microdisplays.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1031-1036
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Electrical Noise Characteristics of Side Emitting LEDs
    Autorzy:
    Šaulys, B.
    Kornijčuk, V.
    Matukas, J.
    Palenskis, V.
    Pralgauskaitė, S.
    Glemža, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506222.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.70.+m
    74.40.-n
    85.60.Jb
    Opis:
    Low frequency noise characteristics of nitride based blue side emitting diodes have been investigated. It is shown that investigated devices distinguish by $1//f^α$-type optical and electrical fluctuations caused by various generation-recombination processes through defects formed generation-recombination centers. At higher frequencies optical shot noise due to random photon emission prevails $1//f^α$-type spectrum. The results have shown that low frequency optical and electrical noises are strongly correlated at small current region, but at higher forward current not correlated noise components dominate. Lenses and secondary optics of the investigated devices do not influence output light.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 244-246
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laboratory System for Quantum Cascade Lasers Researching
    Autorzy:
    Mikołajczyk, J.
    Pichola, W.
    Wojtas, J.
    Mamajek, M.
    Garlińska, M.
    Prokopiuk, A.
    Bielecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399386.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.60.Bt
    85.60.Jb
    42.55.Px
    42.72.Ai
    Opis:
    The paper presents a prototype of a driving system designed to laboratory investigations of quantum cascade lasers. Significant requirements of these lasers operation, as well as a construction of the main components of the system were analyzed. During the performed investigations, a tuning range of both current pulses and temperature control operation were determined. Additionally the method of monitoring both current and voltage of the lasers was also described. As a summary, results of laboratory studies of the system with the use of commercial quantum cascade lasers were presented.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 505-508
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light-Emitting Diode Degradation and Low-Frequency Noise Characteristics
    Autorzy:
    Šaulys, B.
    Matukas, J.
    Palenskis, V.
    Pralgauskaitė, S.
    Kulikauskas, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505229.pdf
    Data publikacji:
    2011-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.70.+m
    74.40.-n
    85.30.-z
    85.60.Jb
    Opis:
    Comprehensive investigation of phosphide-based red and nitride-based blue light-emitting diodes characteristics and physical processes that take place in device structure during aging has been carried out. Analysis of noise characteristics (the emitting-light power and the LED voltage fluctuations, also their cross-correlation factor) shows that investigated LEDs degradation is caused by defects that lead to the leakage current and non-radiating recombination increase in the active region or its interfaces. Appearance of the defects first of all manifests in noise characteristics: intensive and strongly correlated $1//f^{α}$ type optical and electrical fluctuations come out.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 4; 514-520
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czochralski-Based Growth and Characteristics of Selected Novel Single Crystals for Optical Applications
    Autorzy:
    Shimamura, K.
    Víllora, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399453.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.St
    77.84.-s
    85.60.Jb
    42.79.Bh
    78.20.Ls
    85.70.Sq
    Opis:
    In the Year of Professor Jan Czochralski, we with pleasure review the representative recent works of our group, Optical Single Crystals Group, NIMS, Japan. Our group has been working on the development of novel single crystals for optical applications based on the Czochralski technique. Here, 4 kinds of topics are reviewed. 1st one is ferroelectric fluoride $BaMgF_{4}$ single crystals for UV nonlinear optical applications including quasi-phase matching device fabrications. 2nd one is transparent conductive $\beta-Ga_{2}O_{3}$ single crystals as semiconductor, which has large band-gap, 4.8 eV, for LED applications. 3rd one is F-doped core-free $Y_{3}Al_{5}O_{12}$ single crystals as a potential new lens material for UV/VUV wavelength region. Last one is superior magneto-optical ${Tb_3}[Sc_{2-x}Lu_{x}](Al_{3})O_{12}$ single crystals for near infrared to visible region, and $CeF_3//PrF_3$ single crystals for UV region.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 265-273
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Shifter Operation of the Azimuthally Magnetized Coaxial Ferrite Waveguide
    Autorzy:
    Georgieva-Grosse, M.
    Georgiev, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419702.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.60.Lj
    02.90.+p
    41.20.-q
    41.20.Jb
    85.70.Ge
    Opis:
    The terms for operation of the coaxial waveguide, entirely filled with azimuthally magnetized latching ferrite, as a digital nonreciprocal phase shifter for the normal $TE_{01}$ mode, are found. They are classified as physical, mathematical and functional ones. The physical prerequisites are drawn from the phase curves of the structure and specify the boundaries of the interval in which it produces differential phase shift for a given numerical equivalent of the modulus of off-diagonal ferrite permeability tensor element. The mathematical condition brings the parameters of configuration together with certain roots of its characteristic equation, derived in terms of complex Kummer and Tricomi confluent hypergeometric functions and with the related to them positive real $L_2(c,ρ,n)$ numbers (c=3, 0<ρ<1, n=1). The functional criteria determine the borders of the domain of phase shifter operation of the geometry. These are functions, defined for a fixed central conductor thickness which express in normalized form the impact of the guide radius on the phase shift at the cut-off frequencies and at the envelopes, denoting the termination of the phase curves for negative ferrite magnetization from the side of higher frequencies. The same are reckoned, employing iterative methods, consisting in a repeated numerical solution of the equation mentioned, followed by a computation of the guide radius and phase constant of the wave and are plotted graphically. The influence of the parameters of transmission line on the area referred to is analyzed.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 63-70
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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