- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Green and Stable Processing of Organic Light-Emitting Diodes from Aqueous Nanodispersion
摘要： An imminent show-stopper for up-scaled production of printed thin-film electronics are the flammable and environmentally hazardous solvents used to dissolve the organic semiconductors. Especially in the case of wide-web large-area coating the development of toxic and flammable vapour during coating and drying poses serious health and safety risks. Processing the active materials from aqueous nanodispersion therefore offers a highly attractive alternative. In contrast to thin-film organic photovoltaics (OPV), nanoparticle-based organic light-emitting diodes (OLEDs) have so far received only little attention. The very high electrical field (~0.1 GV/m) poses rather “unforgiving” requirements regarding the topology, integrity and chemistry of the active layer, seemingly difficult to achieve using aqueous nanodispersions. In this work we show that it can be done. We present polymer light-emitting diodes (PLEDs) with active layers processed from nanodispersion. Through thorough optimization of the particle preparation and casting procedures, we obtain smooth, dense and intergral light-emitting nanoparticle films compatible with stable PLED operation. The performance of the nanoparticle PLEDs is on par with that of solution-cast reference devices. The devices exhibit low leakage current and turn-on voltage, no sign of degradation through voltage cycling, no current hysteresis and similar efficiencies.
关键词： organic light-emitting diodes,aqueous nanodispersion,green processing,nanoparticle films,polymer light-emitting diodes
更新于2025-09-23 15:21:01
-
Correlation Between Nanodispersion of Organo-Modified Nanodiamond in Solvent and Condensed Behavior of Their Organized Particle Films
摘要： Organo-nanodiamond (ND) by surface modification using several surfactants has achieved nanodispersion in organic solvent as if these nanoparticles were dissolved. High surface coverage has reduced the aggregated particle size of organo-ND particles in the solvent, and their modification by fluorocarbon chain has achieved nanodispersion in a nonpolar solvent. By using a spreading solvent for single particle layers on the water surface of various organo-NDs of resulting dispersion medium, a close relation was found between the dispersion characteristics of organo-nanoparticles in the solvent and the condensation behavior in their two-dimensional single particle layer. Organo-ND with high dispersion ability in solvent has inferior two-dimensional condensability as a single particle layer. Sufficient retention time is necessary to form a homogeneous single particle layer on the water surface. The reason behind this property was found to be the secondary aggregation of organo-modified nanoparticles at the air/water interface. Since lipophilicized ND is not necessarily stable on the water surface, increasing aggregated particle size and three-dimensionality were confirmed in the case where the particle compression rate during two-dimensional integration was relatively fast.
关键词： Single Particle Layer,Nanodispersion,Surface Modification,Dependency on Compression Rate,Nanodiamond
更新于2025-09-11 14:15:04