A novel electroluminescent PPV copolymer and silsesquioxane nanocomposite film for the preparation of efficient PLED devices

Abstract

Polymer light-emitting diodes (PLEDs) have attracted growing interest in recent years for their potential use in displays and lighting fields. Nevertheless, PLED devices have some disadvantages in terms of low optoelectronic efficiency, high cost, short lifetimes and low thermal stability, which limit their final applications. Huge efforts have been made recently to improve the performances of these devices. The addition of inorganic or hybrid organic-inorganic nanoparticles to the light-emitting polymers, for example, allows their thermal stability and electroluminescent efficiency to be increased. Following this approach, novel PLED devices based on composite films of PPV-derivative copolymer (commercial name Super Yellow, SY) and octaisobutil POSS, were developed in this study. The device containing Super Yellow loaded with 1 wt% of POSS showed higher efficiency (ca. +30%) and improved lifetime in comparison to PLED prepared with the pure electroluminescent polymer. The PLED devices developed in this study are suitable candidates for automotive dashboards and, in general, for lighting applications.

Organo-modified ZnO nanoparticles: tuning of the optical properties for PLED device fabrication

“…8B, curve b). It can thus be proposed, in agreement with the literature, 40 that the presence of ZnO_Isobutyl nanoparticles has a positive effect on the emission properties of the SY active layer because a reduction of copolymer chain aggregation is promoted. The comparison of the I-V curves of the devices assembled with SY and SY-ZnO samples (pixel size of 16 mm 2 ) is reported in Fig.…”

“…The high chemical compatibility of isobutyl chains with the SY matrix was proved in our previous manuscript in which octaisobutyl POSS was used as a filler for the preparation of efficient light-emitting SY composites. 40 Following this approach, a homogeneous active layer containing ZnO_Isobutyl NPs was used for the fabrication of a novel PLED device. 40 Devices containing a polymer matrix doped with ZnO_NH 2 , ZnO_Phenyl and the unmodified NPs have also been taken into account.…”

“…40 Following this approach, a homogeneous active layer containing ZnO_Isobutyl NPs was used for the fabrication of a novel PLED device. 40 Devices containing a polymer matrix doped with ZnO_NH 2 , ZnO_Phenyl and the unmodified NPs have also been taken into account. Nevertheless, in these cases, the dispersion of the ZnO NPs was very poor because of the low affinity with the polymer matrix, and the final materials were not suitable to the optoelectronic characterization.…”

Efficiency enhancement in a single emission layer yellow organic light emitting device: Contribution of CIS/ZnS quantum dot

“…Additionally, the turn-on voltage value of our reference device is 1.8 V, lower than that of ref [36] and all of the performance values are comparable even with the generally acknowledged yellow emitting phenylenevinylene derivative, i.e. supper yellow [37]. The better performance values of this study are attributed to the use of less volatile solvent (PhCl vs chloroform) and optimization of the stock polymer concentrations and the coating rates used during the spin coating process through optical studies.…”

Synthesis of Novel Luminescent Double-Decker Silsesquioxanes Based on Partially Condensed TetraSilanolPhenyl POSS and Tb3+/Eu3+ Lanthanide Ions

“…POSS and their metal-functionalized derivatives typically exhibit molecular sizes, high chemical versatility and good mechanical and thermal stabilities [8,21]. Furthermore, these solids attracted an increasing interest in several scientific and technological fields, finding applications as heterogeneous catalysts [5,6,22,23] for biomedical and diagnostic uses [18,21,[24][25][26][27], for the fabrication of 3D nanostructured materials with well-defined physico-chemical features [28][29][30][31][32][33][34][35] and for the development of original cage-based materials with different porosity and host-guest chemistry [36][37][38][39].…”