• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.887-888
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• 2003

We report the electroluminescence properties of single- and multi-layer electroluminescence devices using PtOEP phosphor. Weak emission bands with peaks at 540 and 567 nm are observed in the former and latter devices, respectively, besides the well-known 648 nm PtOEP emission. The 540 nm emission increases in proportion to the third power of current density, while the 648 nm emission band increases linearly. Discussion is made on a reason for a much smaller luminance of PtOEP compared with $Ir(ppy)_{3}$ phosphor.

• 한국가시화정보학회지
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• 제9권1호
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• pp.36-41
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• 2011

It is highly needed to measure the dissolved oxygen (DO) concentration field in water for a variety of purposes such as biological, industrial, environmental monitoring and medical application. Application of PSP (Pressure Sensitive Paint) which is sensitive to oxygen concentration has been carried out to measure DO concentration field using PtOEP/PS film and intensity based method under the UV-LEDs illumination. A micro round water jet having 100% of DO was obliquely impinged on to a PtOEP/PS film coated plate placed in a 0% of DO water container. DO concentration fields on the impinging plate were quantitatively visualized with a $2.94\;{\mu}m$ of spatial resolution. Through pixel-by-pixel calibration, uncertainty of each pixel by different sensitivity, different dye concentration and non-uniformity of illumination was removed. It is demonstrated that the high DO concentration region was coincided with the impingement area. The DO concentration gradient due to DO diffusion was affected by Reynolds number.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.577-582
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• 2006

Unlike the case of $Ir(ppy)_3$, various aggregates of PtOEP including dimer are formed in PtOEP-doped films and neat film. Such a difference is due to difference of competition among solid state solvation effect, dipole-dipole interactions between dopant molecules, and intermolecular covalent bonding.

• Journal of Information Display
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• 제8권2호
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• pp.15-19
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• 2007

We have studied the effect of host materials on the electrophosphorescence properties by comparing three different host materials such as tris(8-hydroxyquinoline)-aluminum (III) $(Alq_3)$, bis(8-hydroxyquinoline)-zinc (II) $(Znq_2)$, and 4,4'-N,N' dicarbazole-biphenyl (CBP) doped with a red-emissive phosphorescent dye, 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum (II) (PtOEP). The EL spectra show a strong red emission (peak at 650 nm) from the triplet excited state of PtOEP and a very weak emission from an electron transport layer of $Alq_3$ and a hole transport layer of N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1-biphenyl-4,4'-diamine (TPD). We find that the triplet exciton lifetime and the quantum efficiency decrease in the order of CBP, $Alq_3$, and $Znq_2$ host materials. The results are interpreted as a poor exciton confinement in $Alq_3$, and $Znq_2$ host compared with in CBP. Therefore, it is very important for the triplet-exciton confinement in the emissive layer for obtaining a high efficiency.

• 한국항공우주학회지
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• 제32권4호
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• pp.12-17
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• 2004

고속 유동 속에 놓인 모델 표변의 압력분포를 정량적으로 측정하기 위해 PSP 기술이 사용되고 있다. 본 연구에서는 아음속 유동에 적용 가능한 PSP 기술을 개발하였다. 2가지의 백금계열 (PtOEP와 PtTFPP)의 발광분자와 2 가지의 폴리머 (Poly(TMSP)와 RTV-118)를 사 용하여 4가지의 PSP 조합을 만들어 그 성능을 확인하였다. 압력변화에 따른 PSP의 발광강 도를 측정하기 위해 $0{\sim}11kPa$까지 0.5, 1, 2kPa썩 압력을 증가시키면서 정적보정실험을 수행하였다. 4가지의 PSP 조성 중에 PtOEP 와 RTV-118의 조합이 가장 좋은 성능을 보였다. 충돌평판에 작용하는 압력장 분포를 측정하기 위하여 경사충돌분류에 본 연구에서 개발된 PSP 기술을 응용하였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.688-693
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• 2003

The PSP technique has been used to measure pressure distribution on a model surface quantitatively. The objective of this study is to develop PSP technique which can be applied to low-speed flows. Four different PSP formulations including two porphyrins (PtOEP and PtTFPP) and two polymers (Poly(TMSP) and RTV-118) were tested and the performance of each combination was checked. In the static calibration, the luminescent intensity of the PSP coatings was measured from 0kPa to 11kPa with 0.5, 1, 2kPa increments. Among 4 PSP formulations tested, the combination of PtOEP and RTV-118 shows the best performance. The PSP technique was applied to an oblique impinging jet to measure the pressure field distribution on the impinging plate.

• 공업화학
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• 제27권6호
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• pp.639-645
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• 2016

본 연구는 음용가능한 수준의 비독성, 비휘발성 식물성 오일에서 PtOEP와 DPA를 광감응제와 전자수용체로 이용해 구현되는 효율적인 TTA-UC현상에 대해 보고하고 있다. 다양한 종류의 식물성 오일에 PtOEP/DPA를 담지시켰을 때, 탈산소 공정없이도 532 nm의 입사 레이저에서 430 nm 영역의 선명한 green-to-blue UC현상이 관측되었으며, 양자수율은 약 8%로 측정되었다. 이러한 UC의 효율은 식물성 오일의 화학적 조성, 특히 불포화 탄화수소의 함량과 점도에 크게 의존하는 것으로 나타났다. 식물성 오일에서의 Stern-Volmer 상수값은 유기용매에 비해 다소 낮은 값을 보였으나, 전환효율은 93% 정도로 여전히 높은 수치를 보여주었다. 해바라기씨유에서 UC의 전환 입사광 강도($I_{th}$)는 약 $100mW/cm^2$로 태양광의 직접활용에는 아직 무리가 있으나, 산소포화조건에서 비독성 매질을 통해 즉각적으로 구현되는 UC는 비전통적인 방식의 bioimaging과 같은 기술에의 응용가능성이 높을 것으로 생각된다.

• 대한기계학회논문집B
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• 제26권7호
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• pp.1031-1038
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• 2002

The pressure sensitive paint (PSP) has recently received a considerable attention in the fields of aerodynamics and fluid mechanics as a new revolutionary optical technique to measure pressure fields on a body surface. In this study, the feasibility and effectiveness of the PSP pressure field measurement technique have been investigated experimentally. Seven different PSP formulations including two porphyrins(PtOEP and PtTFPP) and four polymers(Polystyrene, cellulous acetate butyrate, GP-197 and Silicon-708) were tested to check the performance and characteristics of each combination. The static calibration of each PSP formulation was carried out in a constant-pressure chamber. The PSP technique was applied to an oblique impinging jet flow to measure variation of pressure field on the impinging plate at on oblique jet angle of ${\theta}=60^{\circ}$. Pressure field images were captured by an 12bit intensified CCD(ICCD, $1K{\times}1K$)camera. As a result, the dynamic response of PSP depends on the oxygen permeability of polymer and the photochemical interaction between luminophore and polymer as well as the reaction of luminophore itself. The reaction of luminophore was changed by employing different polymers. In conclusion, Among 7 PSP formulation tested, the combination of PtTFPP and cellulous acetate butyrate show the best performance. In addition, the detail pressure field of an oblique high-speed impinging jet was measured effectively using the PSP technique.

• 한국가시화정보학회지
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• 제9권4호
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• pp.41-46
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• 2011

Oxygen sensitive functional particles(OSParticle) were fabricated by three different methods for using the particles as oxygen sensors and PIV tracers. The used methods were a physical coating method, an ion-exchange method and a dispersion polymerization method. The physical coating method is dipping $SiO_2$ hollow particles into dye solution then drying. This method is very simple, but particles are not uniform in diameter and luminescence. The particles fabricated by the ion-exchange method have very uniform diameter and well doped. However, it can not be used in water since the particles are hydrophobic. In case of the dispersion polymerization method, the diameter of OSParticles is quite uniform. The diameter of OSParticles can be changed by controlling the quantity of AIBN (2,2'-azobis isobutyronitrile). For the purpose of dissolved oxygen concentration measurement in micro scale water flows, the dispersion polymerized OSParticles turn out to be the most superior functional particles. The luminescent intensity of OSParticles was tested with the variation of dissolved oxygen concentration in water samples. As a result, the luminescent intensity of OSParticles is monotonically decreased with increasing DO (Dissolved oxygen) concentration of water.

• Ocean and Polar Research
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• 제35권3호
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• pp.229-237
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• 2013

We measured two-dimensional (2-D) oxygen distribution in the surface sediment layer of intertidal sediment using a simple and inexpensive planar oxygen optode, which is based on a color ratiometric image approach. The recorded emission intensity of red color luminophore light significantly changed with oxygen concentration by $O_2$ quenching of platinum(II)octaethylporphyrin (PtOEP). The ratios between the intensity of red and green emissions with oxygen concentration variation demonstrated the Stern-Volmer relationship. The 2-D oxygen distribution image showed microtopographic structure, diffusivity boundary layer and burrow in surface sediment layer. The oxygen penetration depth (OPD) was about 2 mm and the one-dimensional vertical diffusive oxygen uptake (DOU) was 12.6 mmol $m^{-2}d^{-1}$ in the undisturbed surface sediment layer. However, those were enhanced near burrow by benthic fauna, and the OPD was two times deeper and DOU was increased by 34%. The simple and inexpensive oxygen planar optode has great application potential in the study of oxygen dynamics with high spatiotemporal resolution, in benthic boundary layers.