Institut Penyelidikan dan Teknologi Nano Optoelektronik (INOR) - Tesis
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Browsing Institut Penyelidikan dan Teknologi Nano Optoelektronik (INOR) - Tesis by Type "master thesis"
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- PublicationDeposition And Characterization Of Polyfluorene / Cerium Oxide Organic-Inorganic Thin Films(2022-07)Farah Hayati, Haji AhmadThe investigation of a novel approach by applying an organic polyfluorenes (PFs) layer on inorganic high dielectric constant (k) cerium oxide (CeO2) film for potential use as passivation of silicon (Si)-based metal-oxide-semiconductor (MOS) devices was carried out. Initially, the effects of post-deposition annealing temperatures (400, 600, 800, and 1000 °C) was carried out onto the CeO2 films in order to investigate the changes of temperatures onto structural, morphological, optical and electrical characteristics of the CeO2 films. Subsequently, different composition of PFs was dissolved in toluene and deposited onto indium tin oxide glass substrate to examine the effects of varying PFs composition onto the optical, structural, morphological and electrical properties of the PFs. The optimised PFs composition was then applied as an overlayer stacked on CeO2 films post-deposition annealed at different temperatures to fabricate functional Al/PFs/CeO2/Si/Al hybrid organic-inorganic Si-based MOS device, which was relatively new. Structural, morphological, optical, and electrical properties demonstrated by the stacking PFs on CeO2 films were compared with the samples consisting of single CeO2 films. Outcome of the study revealed that the samples having stacking of PFs on CeO2 films could not surpass the performance provided by single CeO2 films. Nonetheless, the stacking of PFs on CeO2 films provided a breakthrough in the context as a potential high k passivation layer to replace the conventional low k silicon oxide (SiO2) due to the adequately higher k value and comparable current-voltage characteristics with CeO2.
- PublicationDesign Optimization And Characterization Of White Light For Led Street Light Application(2022-06)Ying, Jocelynn Kee XiaoThe aim of this study was to evaluate the effects of lens type and shape on the light performance from surface mounted device light emitted diode (SMD LED) street light. Another factor considered was the influence of various shapes of the light emitting surface (LES) on the SMD LEDs and size of the SMD LED on light distribution. Besides, the effects of varying correlated colour temperature (CCT) of the LEDs were also investigated. Optical characterization was carried out using the Goniophotometer (GO-2000) and Integrating Sphere (PCE-200A). DIALux Evo software was used to perform the simulation. Road parameters, such as pole distance of 35 m and pole heights of 8 m on a 7 m width road were used. The road requirement was according to the Tenaga Nasional Berhad (TNB), whereby the street lights must comply with ME4A road classification requirements. The findings showed that Lens E demonstrated a better light performance as compared to Lens A, Lens B, Lens C and Lens D, owing to the rectangular shape of Lens E. The smaller shape of the rectangular lens with classification of Type II-M has lesser light pollution problems. A study comparison between the different CCTs was conducted. Warm White was selected for further investigation into the different shape and size of SMD LEDs as well as key colour for colour mixing.
- PublicationSynthesis And Characterization Of Lanthanum Oxide-Polyvinyl Alcohol Phosphor Nanofibers For White Light-Emitting Diode (Wled)(2022-01)Abdul Wahab, Hasmaifarahatul HidayahThis study involves the novel application of La2O3-PVA as phosphor nanofibers for white light-emitting diode (WLED). The synthesized of La2O3-PVA phosphor nanofibers by electrospinning process were then applied as phosphor to produce white light. The chromaticity coordinates (CIE), correlated color temperature (CCT) and color rendering index (CRI) value were obtained. The potential of La2O3-PVA phosphor nanofiber was investigated by using three parameters which are different sizes of needle diameter, different thicknesses of nanofiber, and different annealing temperatures. The La2O3-PVA phosphor nanofibers were synthesized on glass substrates using electrospinning process at a distance of 17 cm from the nozzle tip, 11.7 mm diameter of the syringe, 17 kV of voltage supply with a flow rate of 0.5 ml/hour. Five different sizes of needle diameter were used to obtain the most stable and uniform nanofiber. Different thicknesses of La2O3-PVA phosphor nanofibers were prepared using 2, 4, 6, and 10 ml volume of precursor solution with thickness of 2.0, 6.0, 13.0, and 59.0 μm, respectively.