Light-Induced Fine-Tuning of Optical Cavities for Organic Optoelectronic Devices

Photonic processing techniques offer novel perspectives on material manipulation and device enhancement. Yet their potential remains largely untapped in organic materials due to complex material interactions. Here we report a transformative approach for the optimization of organic hole transport layers (HTLs) through light irradiation in ambient conditions. This innovative method maintains the conductivity of HTLs robustly while achieving a uniform reduction in thickness. Remarkably, the thickness reduction is controlled and is applicable to various organic materials. The practical application of this technique is validated in the successful fabrication of organic photodetectors and organic light-emitting diodes. Moreover, this strategy enables the precise structuring of organic HTLs with micrometer-scale resolution, opening new opportunities for the integration in organic electronic devices.