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Po-Ching Kao,Shu-I Lin,Chin-Chih Chang,Ching-Wen Huang,Chien-Chi Liu 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
A cathode buffer layer of lithium hydroxide (LiOH) was used to improve the electro-optical properties of organic light-emitting diodes (OLEDs). LiOH layers with various thicknesses were prepared by thermally evaporating LiOH powders. When a 1-nm-thick LiOH layer was inserted between the aluminum (Al) cathodes and the tris(8-hydroxyquinolinato)aluminum (Alq3) electrontransporting layers, device properties such as the turn-on voltage, the maximum luminance, and the device efficiency were improved, becoming better than those of the device with a LiF buffer layer. The surface of the Alq3 film became smoother after the LiOH layer had been deposited. Ultraviolet photoelectron spectroscopy results show that the reaction between LiOH and Alq3 results in an n-type doping effect, which moves the Fermi level close to the lowest unoccupied molecular orbital (LUMO) of Alq3. Thus, the electron-injection efficiency was enhanced due to a lower electron injection barrier, which improved the charge carrier balance in the OLEDs and led to a better device efficiency.
Cheng-Liang Huang,Hung Ji Huang,Sy-Hann Chen,Yu-Siang Huang,Po-Ching Kao,Yuan-Fong Chou Chau,Hai-Pang Chiang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
This study used photochemical reduction to successfully synthesize triangular silver nanoplates (TAgNPs)and silver nanodecahedrons (AgNDs) with higher light-absorption and higher light-scattering properties,respectively, for the same wavelength. To analyze the contribution of light-absorption and lightscatteringof silver nanoparticles to the localized surface plasmon resonance (LSPR) effect, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate was doped with TAgNPs or AgNDs at the same concentration(1.17 lg/cm2) and made into polymer light-emitting diodes (PLEDs). According to the current densityvoltageluminancecharacteristics and electroluminescence (EL) spectra, the enhancement factors for currentefficiency and EL intensity for AgND-containing PLEDs were found to be higher than those for PLEDwith TAgNPs by 24.9% and 138%, respectively. This shows that the metal nanoparticles with higher lightscatteringproperty can induce a relatively strong LSPR effect, which possibly gives a hint to design plasmonicphotovoltaic in future.