Preparation and characterization of Ni-indium tin oxide cosputtered thin films for organic light-emitting diode application

Abstract The characteristics of organic light-emitting diode (OLED) can be improved by the doping of nickel (Ni) into indium tin oxide (ITO) anode. Ni-doped ITO films were synthesized using Ni and ITO cosputter approach. Film properties, such as surface roughness, optical transmittance, sheet resistivity, and surface work function, independent of Ni-doping level were examined. Results show that the Ni-doped ITO films perform lower surface roughness and higher surface work function without scarifying the optical transmittance after thermal annealing at 300 8C. OLED devices with an Al/tris(8-hydroxyquinoline)aluminum/N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'biphenyl-4,4'-diamine/ITO/glass structure were fabricated to investigate the effect of the Ni-doped ITO anode. From the I-V characteristics of the OLED devices, the threshold voltage can be reduced from 12 to 8 V when the Ni atomic concentration is greater than 1.8%.

Optimal Color Stability for White Organic Light-Emitting Diode (WOLED) by Using Multiple-Ultra-Thin Layers (MUTL)

The work demonstrates the improvement of color stability for white organic light-emitting diode (WOLED). The devices were prepared by vacuum deposition on ITO-glass substrates. These guest materials of 5,6,11,12-tetraphenylnaphthacene (Rubrene) were deposited in 4,4′-bis(2,2-diphenyl vinyl)-1,1′-biphenyl (DPVBi), resulting in an emitting layer. Experimental results reveal that the properties in the multiple-ultra-thin layer (MUTL) are better than those of the emitting layer with a single guest material, reaching the commercial white-light wavelength requirement of 400–700 nm. The function of the MUTL is as the light-emitting and trapping layer. The results show that the MUTL has excellent carrier capture effect, leading to high color stability of the device at various applied voltages. The Commissions Internationale De L’Eclairage (CIE) coordinate of this device at 3~7 V is few displacement and shows a very slight variation of (0.016, 0.009). The CIE coordinates at a maximal luminance of 9980 cd/m2 are (0.34, 0.33)

Enhancement and Quenching of Fluorescence by Silver Nanoparticles in Organic Light-Emitting Diodes

The influence of silver nanoparticles (SNPs) on the performance of organic light-emitting diodes (OLEDs) is investigated in this study. The SNPs are introduced between the electron-transport layers by means of thermal evaporation. SNPs are found to have the surface plasmon resonance at wavelength 525 nm when the mean particle size of SNPs is 34 nm. The optimized OLED, in terms of the spacing between the emitting layer and SNPs, is found to have the maximum luminance 2.4 times higher than that in the OLED without SNPs. The energy transfer between exciton and surface plasmons with the different spacing distances has been studied

2022 IEEE 5th International Conference on Knowledge Innovation and Invention (ICKII 2022)

This volume represents the proceedings of the 2022 IEEE 5th International Conference on Knowledge Innovation and Invention (IEEE ICKII 2022). This conference was organized by the Institute of Electrical and Electronics Engineers (IEEE), National Dong Hwa University, International Institute of Knowledge Innovation and Invention (IIKII), and held on July 22–24, 2022 in Hualien, Taiwan. The conference provided a unified communication platform for researchers in a range of topics, such as information technology, innovation design, communication science & engineering, applied mathematics, computer science, electrical & electronic engineering, mechanical & automation engineering, green technology & architecture engineering, material science and other related fields. This proceedings volume enables interdisciplinary collaboration of science and engineering technologists in the academic and industrial fields, as well as networking internationally

Selected Papers from IEEE ICKII 2018

Electronic engineering and design innovation are both academic and practical engineering fields that involve systematic technological materialization through scientific principles and engineering designs. Technological innovation via electronic engineering includes electrical circuits and devices, computer science and engineering, communications and information processing, and electrical engineering communications. The Special Issue selected excellent papers presented at the International Conference on Knowledge Innovation and Invention 2018 (IEEE ICKII 2018) on the topic of electronics and their applications. This conference was held on Jeju Island, South Korea, 23–27 July 2018, and it provided a unified communication platform for researchers from all over the world. The main goal of this Special Issue titled “Selected papers from IEEE ICKII 2018” is to discover new scientific knowledge relevant to the topic of electronics and their applications