New Physics: Sae Mulli

Aims and Scope

The origin of New Physics: Sae Mulli (NPSM, ISO abbreviation: New Phys.: Sae Mulli.): Sae Mulli (새물리 in Korean characters means ‘new physics’) is the oldest Korean pure scientific journal. It was first published in 1961 just after the Korean War by the Korean Physical Society (KPS). The primary mission of Sae Mulli was to start building up Korean physics research community from almost nothing and in fact Sae Mulli had made tremendous contributions to the Korean science community. Through a peer-review system, Sae Mulli had continued elevating the level of scientific researches, consequently becoming a cornerstone of the economic miracle of Korea...

Editor-in-Chief : Sam Jin KIM
New Physics: Sae Mulli Editorial Board

pISSN : 0374-4914
eISSN : 2289-0041

Tel : +82-2-556-4737
Fax : +82-2-554-1643
E-mail: npsm@npsm-kps.org

Research Papers

Optical Properties of the Eu$^{2+}$ Doped Li$_2$SrSiO$_{4-\alpha}$N$_\alpha$

Purevdulam NAMKHAI¹, Taeyoung KIM¹, Hyun-Joo WOO¹, Kiwan JANG*¹, Jung Hyun JEONG²

¹ Department of Physics, Changwon National University, Changwon 51140, Korea

² Department of Physics, Pukyong National University, Busan 48513, Korea

Li$_2$Sr$_{1-x}$Eu$_x$SiO$_{4-\alpha}$N$_\alpha$ (Li$_2$SrSiO$_{4-\alpha}$N$_\alpha$:Eu$^{2+}$) phosphors were synthesized by using a solid state reaction (SSR) method with submicron Si$_3$N$_4$ and nano Si$_3$N$_4$ powders as the sources of Si and N, and the optical properties of those phosphors were studied. The studied phosphors showed efficient excitation characteristics over the broad range from 230 to 530 nm. Also, They showed broad emission spectra covering a range from 500 to 700 nm, with a peak at 568 nm, which was shifted longer wavelength by 18 nm as compared with that of commercial YAG:Ce$^{3+}$. Combined with a 450 nm blue LED chip, the results support the application of the Li$_2$SrSiO$_{4-\alpha}$N$_\alpha$:Eu$^{2+}$ phosphor as a luminescent material for a white-light source thaat is warmer than the commercial YAG:Ce$^{3+}$ white-light source. In addition, the Li$_2$SrSiO$_{4-\alpha}$N$_\alpha$ phosphors prepared from a submicron Si$_3$N$_4$ powder was found to emit a previously unreported self-activated luminescence in Li$_2$SrSiO$_{4-\alpha}$N$_\alpha$.

New Phys.: Sae Mulli 2018; 68: 1196-1202

Optical Properties of Plasmons in a GaAs/Al$_x$Ga$_{1-x}$As Multiple Quantum Well Under Electric and Magnetic Fields

Hyung Soo AHN*¹, Sang Chil LEE², Suck Whan KIM†³

¹ Department of Applied Physics, Korea Maritime University, Busan 49112, Korea

² Faculty of Science Education, Jeju National University, Jeju 63243, Korea

³ Department of Physics, Andong National University, Andong 36729, Korea

The plasmon behaviors in a superlattice of GaAs/Al$_x$Ga$_{1-x}$As multiple quantum wells with a half-parabolic confining potential due to different dielectric interfaces are studied under magnetic and electric fields perpendicular and parallel to the superlattice axis by using a previously published theoretical framework. From the density-density correlation functions by considering the intrasubband and the inter-subband transitions under the random phase approximation, we calculate the dispersion energies of the surface and the bulk states as functions of the composition of the multiple quantum well structure and of the magnetic field strength and the average electric field strength over the quantum well. The Raman intensities for various magnetic field strengths and average electric field strengths over the quantum well are also obtained as a function of the energy of the incoming light for these states.

New Phys.: Sae Mulli 2018; 68: 1183-1191

New Phys.: Sae Mulli 2018; 68: 1167~1280

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Research Papers

Measurement of Thermal Diffusivity and the Optical Properties of a Carbon Nanotube Dispersion by Using the Thermal Lens Effect

Hyunwoo PARK, Hyunki KIM, Sok Won KIM*, Joohyun LEE

New Phys.: Sae Mulli 2018; 68: 1167-1172 https://doi.org/10.3938/NPSM.68.1167