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박재규,오병성,유영문,윤만영,김대중,최용대,Park, J.G.,O, Byung-Sung,Yu, Y.M.,Yoon, M.Y.,Kim, D.J.,Choi, Y.D. 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.3
Hot wall epitaxy 방법으로 우물층의 두께를 바꾸어가며 ZnSe/CdSe/ZnSe 단일 양자우물을 성장하였다. 양자우물층의 두께는 TEM을 이용하여 측정하였다. 광발광의 세기와 반치폭의 변화로부터 양자우물층의 임계두께는 약 $9{\AA}$임을 알 수 있었다. 우물층의 두께가 임계두께 보다 작을 때 광발광과 PLE 스펙트럼의 비교로부터 stoke's shift를 확인하였고, 이는 엑시톤 결합 에너지에 의한 것임을 알 수 있었다. 우물층의 두께에 대한 광발광 피크의 에너지 이동은 이론치와 잘 일치하였다. ZnSe/CdSe/ZnSe single quantum wells with different well thickness were grown by hot wall epitaxy. The quantum well thicknesses were measured by TEM. The critical thickness of single quantum well layer was found to be about $9{\AA}$ from the intensities and the full-width at half maximum of photoluminescence(PL) spectra. When the thickness of quantum wells was less than the critical thickness, the Stoke's shift was confirmed from the comparison between PL and photoluminescence excitation spectra, and it may be due to the exciton binding energy. The PL peak energy dependence on the quantum well thickness was coincident with the theoretical values.
Fe³+ 불순물이 첨가된 LiTaO₃ 단결정에서의 전자 상자성 공명 연구
민성기(S. G. Min),염태호(T. H. Yeom),이수형(S. H. Lee),이명규(M. K. Lee),신현권(H. K. Shin),유영문(Y. M. Yu),김태훈(T. H. Kim),유성초(S. C. Yu) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.4
Electron paramagnetic resonance (EPR) of Fe³+ in LiTaO₃ single crystal, grown by Czochralski method, has been studied by employing an X-band spectrometer. Resonance spectra of Fe³+ ion on the crystallographic principal axes were obtained with 9.447 ㎓ at room temperature. The spectroscopic splitting parameter g and zero-field splitting (ZFS) parameter D (= 3 B^0₂) are calculated with effective spin Hamiltonian. Fe³+ center in stoichometric single crystal turns out to be different with that in congruent single crystal reported previously. From the analysis of temperature dependence of resonance fields for Fe³+ ion, there is no any phase transition at the temperature range (from -160 ℃ to 20 ℃).