Novel Blue-emitting and Tunable Emissions Prepared by Proton-induced Color Change Materials with Applications to PLED

• Main Authors: Wei-ting Liu, 劉威廷
• Other Authors: Wen-yao Huang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/64r6zq

博士 === 國立中山大學 === 光電工程學系研究所 === 101 === PLEDs for display and lighting application were studied. In this thesis, a novel blue Poly (arylene ether) s polymer was prepared for the organic polymer light emitting diodes which was composed of the main material anthracene difluoro monomer derivatives, and object material of triphenylamine with the extension structure similar to the literature seen BD-1 asymmetric derivatives, as the hole transport material of carbazole of the diol derivatives. In general, Anthracene derivatives and BD-1, often seen in the literature as the host, guest blue polymer doping, the main use to Förster energy transfer to transfer energy to the guest, so it has good luminous efficiency. Anthracene, flat Good, easy to crystallization during evaporation, resulting in leakage generated; and the deposition of the multilayer structure will hinder charge injection to the emitting layer. From the angle of the molecular design of this study. (1) Use of the CF bond and Carbazole increase the steric hindrance of the polymer chain and change by fluoride compounds of the highest occupied molecular orbital - lowest unoccupied molecular orbital energy level. (2) The hole transport layer to import into the emitting layer. The two monomers Anthracene derivatives fluoride monomer the Carbazole of diol derivatives via nucleophilic polycondensation synthesis of a novel in proper proportion, Blue polymer. Component parts, the Blue poly aromatic ether polymer doped with a small amount of blue light-emitting guest as a component layer of the component structure: ITO / PEDOT: PSS / emitting layer / LiF / Al light-emitting layer can make use of spin coating of solvent process, and its advantage is the convenience of the process and a large area. The undoped guest before the Blue polymer production the PLED starting voltage can be reduced to 4.5 V, and maximum brightness 7 466 cd/m2, efficiency as high as 4.2 cd / A. C.I.E. coordinates of (0.15,0.08), very close to the official regulations of the NTSC Blue coordinates (0.14,0.08). When doped with 3% of the guest, the starting voltage can be reduced to 4.5 V, maximum brightness of 12104 cd/m2 and efficiency as high as 5.79 cd/A. The developed original organic RGB color thin film technology enables the optimization of the distinctive features of an organic light emitting diode (OLED) and thin film-transistor (TFT) LCD display. The color filter structure maintains the same high resolution to obtain a higher level of brightness in comparison with conventional organic RGB color thin film. The image-processing engine is designed to achieve a sharp text image for a TFT LCD with organic color thin films. The organic color thin films structure uses an organic dye dopant in a limpid photo resist. With this technology, the following characteristics can be obtained: 1. high color reproduction of gamut ratio, and 2. improved luminous efficiency with organic color fluorescent thin film. This performance is among the best results ever reported for a color-filter used on TFT-LCD or OLED. A Tunable Emission Prepared by Photo-Induced Color-Change Materials with Blue LEDs as Excitation Light Sources. In this thesis, photo-chemically induced emission tuning was used for the definition of pixels emitting the three primary colors of green, orange, and red. This study used the commercially common organic green fluorescent material 10-(2-Benzothiazolyl)-2,3,6,7- tetrahydro-1,1,7,7-tetramethyl-1H,5H,11H-(1)benzopyropyrano(6,7-8-I,j)quinolizin-11-one (C545T). C545T was doped into an SU8-negative photo-resist to prepare the color conversion film. The colors of the color conversion film were adjusted using the time of exposure to UV light (I-line 365 nm). In the unexposed film areas, there was a green fluorescent thin film (L1-Green). The exposure of the selected areas of the thin film increased with the exposure time, and the light acid number of the SU8 photo-resist continuously rose. The interaction of the photo-acid and C545T resulted in acid-induced quenching. When the exposure time was 120 s, the thin film changed to orange (L2-Orange). When the exposure time lasted up to 360 s, the C545T in the thin film finishedreacting with the photo-acid to producemostly protonated C545T, and the thin film changed into a red fluorescent thin film (L3-RED), leading to a wave of red shift. The absorption and the emission of L1, L2, and L3 were photo-chemically induced changes. L1, L2, and L3 were closely attached with the blue PLED backlight to achieve a tunable emission module, which was an optic thin film attached to the color-changing materials. A Tunable Emission Prepared by Proton-Induced Fluorescent Color Change Materials for a Potential Application in PLEDs. Proton-chemically induced emission tuning was used for the definition of pixels emitting three primary colors of green, orange, and red. This study used the benzenesulfonic acid doped C545T in Chlorobenzene. The changed color of C545T was observed by adding benzensulfonic acid. Furthermore, we explored the reversible phenomenon of protonation/deprotonation. The chlorobenzene solution of C545T in the neutral state emits a green fluorescence (L1). When benzenesulfonic acid was added to the C545T solution in chlorobenzene, C545T was protonated and the protonation level increased with increasing the benzenesulfonic acid concentration. The interaction of the protonation acid and C545T resulted in acid-induced quenching. When the ratio of doping between benzenesulfonic and C545T was 1:0.8, light changed form protonation C545T to orange (L2). When the ratio of adding benzenesulfonic acid lasted up to 1:1.6, the C545T in Chlorobenzene finished reacting with the benzensulfonic acid to produce mostly protonated C545T, and the color of Chlorobenzene changed into a red one (L3), leading to a wave of redshift. The absorption and the emission of L1, L2, and L3 were protonation-chemically induced changes. L1, L2, and L3 were doped in the blue PLED device to achieve a tunable emission module. The type 1 device exhibited a turn-on voltage of 5.5 V and a maximum brightness of 10762 cd •m−2. It exhibited a maximum luminous efficiency of 6.55 cd •A−1, an external quantum efficiency of 2.57%, and a power efficiency of 2.75 lm •W−1 with CIE coordinates (0.33, 0.35). In contrast, the type 2 device exhibited a turn-on voltage of 6 V and a maximum brightness of 12866 cd •m−2. It exhibited a maximum luminous efficiency of 5.58 cd •A−1, an external quantum efficiency of 2.61%, and a power efficiency of 2.58 lm •W−1 with the CIE coordinates (0.31, 0.33).