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Temperature Dependence of the Excitonic Energy Band Gap in In(Ga)As Nanostructures
Oleksii Kopylov,이정일,한일기,최원준,송진동,Ina Yeo 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
We analyzed temperature dependent variation of the peak energies in the photoluminescence of InAs/GaAs quantum dots and InAs/In<SUB>0.2</SUB>Ga<SUB>0.8</SUB>As/GaAs quantum dots in asymmetric well. The InAs dots were grown by migration-enhanced molecular beam epitaxy. The peak emission energies decreased monotonously with the increase of the temperature over the range of the measurements, from 13 K to 225 K. The temperature dependence of the peak energy was successfully fitted with two analytic models, namely, the phenomenological Varshni equation and the semi-empirical Fan equation based on electron-phonon statistics, respectively. The physical meaning of the Varshni coefficients is discussed in terms of phonon energy and strain in the nanostructures.
Building a Co-participatory Partnership Framework for School-visit STEAM Outreach Program
( Inae Kang ),( Jungwon Hwang ),( Jin Hye Jang ),( Eunsung Kang ) 한국교육공학회 2016 한국교육공학회 학술대회발표자료집 Vol.2016 No.1
This study aimed to provide a co-participatory partnership framework for a school-visit STEAM outreach program. The framework has been created through a STEAM outreach program practiced between an elementary school and an University hospital, in which 76 students with two teachers, and three medical doctors have participated during the fall semester of 2015. Data analysis collected from interviews and surveys with the participants showed highly positive responses to the program, which, in turn, reflects the usefulness of the framework. The STEAM outreach framework is basically a model of school visit which seems to ensure more possibility of sustaining the outreach program, compared to the models of organization visit more often experienced in most STEAM outreach programs. The framework, on one hand, assumes three pedagogical principles of STEAM (context-based, creative design, affective experience) in developing the STEAM outreach program, and the other hand, suggests three stages of management (planning, designing, and implementing), each of which describes specific roles of the participants, and things to consider for the outreach program management.
Planarized B,N-diarylated dibenzoazaborine compounds for deep blue fluorescence
Ina Nur Istiqomah,Hanif Mubarok,Tae Hwan Lee,Ngoc Tuyet Nhi Nguyen,Jaehoon Jung,Min Hyung Lee 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.2
A series of planarized B,N-diarylated dibenzoazaborine compounds (5a?5e) in which various functional groups are introduced into the B-Ph and N-Ph moieties of nonsubstituted dibenzoazaborine compound (I) were prepared. All compounds exhibit strong low-energy absorptions at ca. 410?426?nm with a gradual red-shift depending on the electron-accepting property of the four substituents (4-R = 4-Ph?<?4-Pm?<?4-CNPh <4-CN) on the B-Ph ring in 5a?5d. Introduction of an electron-donating tBu group into the N-Ph ring further shifts slightly the absorption band toward a lower-energy region (5e). Importantly, all compounds undergo gradual red-shifts in the emission leading to deep blue fluorescence for CN-substituted 5d and 5e. Furthermore, the emissions have narrow full width at half maximum values of ca. 30?nm, high photoluminescence quantum yields (ΦPL?≈?100%), and small Stokes shifts (11?16?nm). The electrochemical and theoretical studies further support the bandgap control and photophysical properties of compounds.