In this study, composite pouch films incorporating ionite were fabricated, and their structural properties as well as temperature variations during charge–discharge cycles were evaluated to examine their applicability as heat-suppression pouch films for secondary batteries. The films were prepared using a film coater (Coretech, CT-AF300), with variations in ionite content and particle size. In addition, the effects of plasma treatment on the surface state of PET films were investigated to enhance coating adhesion, with the aim of determining the optimal fabrication conditions. Furthermore, an infrared thermal imaging camera and a custom-built test device were employed to measure the temperature differences with and without the pouch films during charge– discharge processes, thereby assessing the potential of developing next-generation high-performance pouch films.

In this study, quantum dots with Au/CdSe complex cores composed of Au as a metal base were synthesized, syrup was prepared, and coated on natural simulated LED unit modules, and the optical properties of traffic signs using them were investigated, and the following conclusions were obtained. The nanoparticles synthesized at 260°C and 280°C grew into irregular shapes with PL wavelengths of 624-627㎛, half-widths of 35㎛, PL-QY ratios of 55-61%, and grain diameters of 5-7㎛. The quantum dot syrup was applied to the LED unit module to produce a traffic sign composed of 4CL unit modules, and the luminance of 179 ㏅/㎡, insulation resistance of 10,000㏁, and insulation withstand of 500V were achieved, meeting the performance and specifications of the standard guidelines for luminescent traffic safety signs. The surface temperature of the unit module laminated with 4CL resin is 24~25℃, which shows a stable heat distribution, confirming that it can be applied as a sign using unit modules.

In this study, high-efficiency InZnP/ZnSe/ZnS quantum dots (QDs) were synthesized and applied to the development of self-luminous traffic signs. The synthesized QDs exhibited a photoluminescence (PL) peak wavelength of 613 nm and a uniform nanoparticle size of 6 nm in diameter. Quantum dot films were coated using a roll-to-roll process with varying thicknesses (110 μm, 85 μm, and 75 μm), and color coordinate analysis confirmed that all films fell within the red region. A 4CL resin and PCB with high thermal dissipation properties were employed to fabricate the self-luminous traffic signs. Performance evaluations showed a white luminance of 625.4 cd/㎡, a red luminance of 220.2 cd/㎡, an insulation resistance of 10,000 MΩ, and an insulation breakdown voltage of 500V, indicating excellent performance. This study confirms the potential of InZnP-based QDs as an environmentally friendly alternative to conventional Cd-based QDs. Furthermore, the integration of high-efficiency QD films with advanced heat-dissipating PCB technology is expected to improve traffic safety, particularly in low-visibility and nighttime environments

This study is about the optical properties of InP-based quantum dot nanoparticles depending on their core/shell structure. The need to synthesize non-cadmium-based quantum dot nanoparticles with high quantum efficiency has become necessary due to the harmful effects of the element cadmium. We synthesized three types of quantum dot nanoparticles in 2000ml three-necked flasks by varying the synthesis temperature and time to have the same PL spectra according to the composition of the core and shell. The PL spectra, absolute quantum efficiency, and nanoparticle size were compared and analyzed according to the composition at red emission wavelengths of 614, 616, and 630 nm. InP/ZnSe/ZnS nanoparticles were synthesized with the highest PL-AQY of 94% at 614 μm, and Ga-doped InP/GaP/ZnSe/ZnS nanoparticles were synthesized with the highest PL-AQY of 97% at 616 μm. InZnP/ZnSe/ZnS nanoparticles with alloy cores were able to synthesize quantum dot nanoparticles with a peak PL-AQY of 98% at 630μm.

This study aimed to a sign device using quantum dot film. We synthesized quantum dots with an absolute quantum yield of more than 95% using the solution process method, coated the quantum dot film by mixing it with acrylate resin, made a sign device, and studied the improvement of visibility, and obtained the following conclusions. Quantum dots with absolute quantum yield of 97.63% at 535 nm and 97.85% at 615 nm were synthesized by doping InP with GaP and stacking ZnSe and ZnS composite shells. The synthesized quantum dots were mixed with acrylate syrup at a weight ratio of 10% to coat a film with a luminance uniformity of more than 95%, and the quantum dot film was attached to a luminous display with an insulation capacity of 500 V, an insulation resistance of 99.9 GΩ, and a luminance of 688.5 ㏅/㎠ at white region and 122.3 ㏅/㎠ at red region.

In this study, a mixed resin containing Bis-GMA was developed to produce a light-emitting sign using quantum dots. As a result of measuring the viscosity, color coordinates change, and luminance of the mixed resin, the following conclusions were obtained. The viscosity of the mixed resin decreased as the content of the diluent increased, and viscosity values ​​ranged from 3,627 to 1,349cps showed as a result. The viscosity of the mixed resin decreased as the temperature increased, and the viscosity showed a value of 5,156 to 1,132cps. For the optical properties of InP/GaP/ZnSe/ZnS quantum dots, the absolute quantum efficiency was 91% at 522nm and 90% at 618nm when the gallium was 0.01%. The luminance of the light-emitting sign using the resin mixed with quantum dots was showed 142.6cd/m2 in white and 104.2cd/m2 in the red region.

AI-2.5wt%Li 합금을 시효처리하여 시효거동과 인장성질에 미치는 δ' 상의 영향을 조사하였다. δ' 상의 입자 반경은 시효 시간의 1/3승에 비례하여 조대화하였다. δ' 상과 기지상과의 계면에너지는 0.0073 J/m2, 확산계수는 1.42cm2/sec, 초대화 거동은 MLSW이론에 부합됨을 알 수 있었다. 미세하고 균일하게 분포한 δ'상은 전반적으로 인장강도의 상승을 가져왔으며, 평형상인 δ상의 석출과 이로 인한 무석출물대의 존재로 과시효시 강도가 감소하였다. 인장변형시 전위는 초전위로 아시효와 피크시효시에는 δ'상을 전단하지만 과시효시에는 δ'상을 전단하지 못하고 우회하여 전위루우프를 형성한다.