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RISS 인기검색어
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- 저자 : J. Jagielski (검색결과 2 건)
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Kumar, Sudhir,Jagielski, Jakub,Kallikounis, Nikolaos,Kim, Young-Hoon,Wolf, Christoph,Jenny, Florian,Tian, Tian,Hofer, Corinne J.,Chiu, Yu-Cheng,Stark, Wendelin J.,Lee, Tae-Woo,Shih, Chih-Jen American Chemical Society 2017 NANO LETTERS Vol.17 No.9
<P>Pure green light-emitting diodes (LEDs) are essential for realizing an ultrawide color gamut in next-generation displays, as is defined by the recommendation (Rec.) 2020 standard. However, because the human eye is more sensitive to the green spectral region, it is not yet possible to achieve an ultrapure green electroluminescence (EL) with a sufficiently narrow bandwidth that covers >95% of the Rec. 2020 standard in the CIE 1931 color space. Here, we demonstrate efficient, ultrapure green EL based on the colloidal two-dimensional (2D) formamidinium lead bromide (FAPbBr(3)) hybrid perovskites. Through the dielectric quantum well (DQW) engineering, the quantum-confined 2D FAPbBr(3) perovskites exhibit a high exciton binding energy of 162 meV, resulting in a high photoluminescence quantum yield (PLQY) of similar to 92% in the spin-coated films. Our optimized LED devices show a maximum current efficiency (eta(CE)) of 13.02 cd A(-1) and the CIE 1931 color coordinates of (0.168, 0.773). The color gamut covers 97% and 99% of the Rec. 2020 standard in the CIE 1931 and the CIE 1976 color space, respectively, representing the 'greenest' LEDs ever reported. Moreover, the device shows only a similar to 10% roll-off in eta(CE) (11.3 cd A(-1)) at 1000 cd m(-2). We further demonstrate large-area (3 cm(2)) and ultraflexible (bending radius of 2 mm) LEDs based on 2D perovskites.</P>
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Influence of ion irradiation on the magnetic properties of Fe/Cr multilayers
F. stobiecki,B. Szymanski,M. Urbaniak,T. Lucinski,J. Dubowik,M. Kopcewicz,J. Jagielski,이영백 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
The in uence of Ar-ion irradiation on the microstructure and magnetic properties of Fe/Cr multilayers is studied. An increase in the interface roughness of Fe/Cr multilayers, caused by irradiation with 200 keV Ar ions whose dose exceeds 5 1012 Ar/cm2, is clearly seen by conversion electron Mossbauer spectroscopy (CEMS). This modication of the microstructure induces distinct changes in the magnetization reversal (an increase in remanence magnetization and a decrease in saturation eld), and greatly reduces the giant magnetoresistance (GMR) eect on increasing the irradiation dose. An enhanced immunity of the GMR eect to the ion irradiation on increasing the thickness of Cr layers, as well as correlation between the changes of GMR and the antiferromagnetically coupled fraction, suggests that the main eect responsible for the decrease in GMR is the formation of pinholes. The temperature dependence of remanence magnetization conrms increases in pinhole density and size during implantation. However, for doses exceeding 2 1013 Ar/cm2, volume intermixing seems to be a dominant mechanism responsible for the further degradation of GMR and the antiferromagnetic interlayer exchange coupling.
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