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Photoluminescence of K+(15C5)2K-
Ta-Ryeong Park 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.6
By measuring time-resolved photoluminescence (PL) of K+(15C5)2Kက at low temperatures, we have shown that the optical excitation responsible for the PL is an excitonic transition 4s4p ! 4s4s of Kက ions. The PL growth rate does not show a wavelength dependence, and the decay rate shows only slight variation, which is in contrast to the behavior of the PL from Na+C222Naက that has exciton-polaritons as its optical excitation. At a xed emission energy, the time evolution of the PL is independent of temperature while the intensity decreases with increasing temperature, which implies that the some of the excited states are destroyed very early before they begin to uoresce.
Ta-Ryeong Park 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.2
We have applied uniaxial stress to samarium complexes by intercalating them into the gallery of a layered material and by using a diamond-anvil cell at 28 K. Although uniaxial stress reduces symmetry and removes degeneracy, the overall number of photoluminescence (PL) peaks evidently decreased with the application of uniaxial stress. This contradictory observation is explained by an increased electron-lattice coupling strength under uniaxial stress. This behavior is also conrmed by time-resolved PL data.
Down-conversion of UV by a Layered Solid Intercalated with Coumarin-3-carboxylicacid Anions
Ta-Ryeong Park,Hyungrok Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
Both coumarin-3-carboxylic acid (CA) and CA anions in free space produce broad emissions centered at 438 nm when excited by 337.1-nm UV light. Upon intercalating CA anions into layered double hydroxide (LDH), the emission peak shifts to 498 nm. This huge shift implies that intercalation can be a useful process for producing down-converters of UV light. Application of hydrostatic pressure to the intercalated sample further enhances the red-shift of the emission, which indicates that a uniaxial stress on the CA anions is responsible for the down-conversion.
박타령(Ta-Ryeong Park) 호서대학교 공업기술연구소 2009 공업기술연구 논문집 Vol.28 No.1
본 논문에서는 약 lOOkbar 까지의 고압력하에서 일어나는 물리 현상의 일부를 소개한다 . 분 광학적 방법을 사용하면 고압력이 S i - G e multiple quantum w ell에 서 는 resonant Ram an 효과를 유도 하며 , layered solid에 서 는 staging transformation을 야기하고 ,molecular crystal 인 pentaerythritol에 서 는 structural phase transition을 일으킴을 관찰 할 수 있다 . 고압력을 이용하 면 고압력에서의 현상뿐만 아니라 상압에서의 현상도 연구할 수 있다 .
Ki-Woong Chae,Ta-Ryeong Park,Jeong Seog Kim 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.4
The catalytic activity of ceria originates from oxygen vacancies. Ce2O3 is the most oxygen-deficient end-member of nonstoichiometricceria, CeO2-x. A new method of synthesizing air-stable Ce2O3 from the micron- and nano-sized CeO2 powderwas developed. The key part of this synthetic process is to reduce the sample in a low-pressure H2 gas (10 Torr) under vacuumat 1300°C. The percentage of the Ce2O3 phase in the reduced sample ranges from 55% ~ 96 wt.% according to the powdersize and reduction time. Hydrogen incorporation in reduced ceria was confirmed by secondary ion mass spectrometry depthprofile analysis and vibrational spectroscopic techniques, such as Raman and Fourier transform infrared spectroscopy. Thesurface region (zero depth) showed the highest H concentration that decreased with increasing profiling depth. The locationsof hydrogen incorporated in the Ce2O3 phase in the reduced sample were revealed by calculating the nuclear densitydistribution. The maximum entropy method-based pattern fitting and Dysnomia program were combined to calculate thenuclear density map using the neutron diffraction data.