Quantifying the Three-Dimensional Molecular Arrangement in Polymer–Polymer Blends: Impact of Molecular Weight
ACS Applied Polymer Materials American Chemical Society (ACS) 7:5 (2025) 2986-2996
Simple and Versatile Platforms for Manipulating Light with Matter: Strong Light–Matter Coupling in Fully Solution‐Processed Optical Microcavities
Advanced Materials Wiley 36:20 (2024) e2212056
P‐16.1: Fully Inkjet‐Printed Organic Light‐Emitting Diodes based on a Thermally Activated Delayed Fluorescent Emitter
SID Symposium Digest of Technical Papers Wiley 55:S1 (2024) 1533-1535
A unified picture of aggregate formation in a model polymer semiconductor during solution processing
Advanced Functional Materials Wiley 34:50 (2024) 2314729
Abstract:
One grand challenge for printed organic electronics is the development of a knowledge platform that describes how polymer semiconductors assemble from solution, which requires a unified picture of the complex interplay of polymer solubility, mass transport, nucleation and, e.g., vitrification. One crucial aspect, thereby, is aggregate formation, i.e., the development of electronic coupling between adjacent chain segments. Here, it is shown that the critical aggregation temperatures in solution (no solvent evaporation allowed) and during film formation (solvent evaporation occurring) are excellent pointers to i) establish reliable criteria for polymer assembly into desired aggregates, and ii) advance mechanistic understanding of the overall polymer assembly. Indeed, important insights are provided on why aggregation occurs via a 1- or 2-step process depending on polymer solubility, deposition temperature and solvent evaporation rate; and the selection of deposition temperatures for specific scenarios (e.g., good vs bad solvent) is demystified. Collectively, it is demonstrated that relatively straightforward, concurrent in situ time-resolved absorbance and photoluminescence spectroscopies to monitor aggregate formation lead to highly useful and broadly applicable criteria for processing functional plastics. In turn, improved control over their properties and device performance can be obtained toward manufacturing sensors, energy-harvesting devices and, e.g., bioelectronics systems at high yield.Light regulation of organic light-emitting diodes with conductive distributed Bragg reflectors
Proceedings of SPIE - Volume 12314 - Optoelectronic Devices and Integration XI SPIE (2022)