Long-Term Stable Microlens Array-Integrated Quantum Dot/Siloxane Film for Thin White Backlight Units

Abstract

Reducing the thickness of quantum-dot-incorporated backlight units (QD-BLUs) is an important issue for QD-incorporated display because of various optical sheets and additional barrier films. However, critical challenges such as the aggregation and vulnerability of QDs and the need for a binder for patterning have emerged. Here, we propose a thermally stable and PL-improved microlens/QD-siloxane film (ML/QD film) by UV imprinting of a microlens array on the film surface. Compared to the neat and diffuser/QD films, the thickness of the ML/QD film decreased by 25% to realize white PL, resulting in less QD usage. The ML/QD film showed superior, long-term thermal and moisture stability and a wide color gamut (109% related to NTSC). A glass-fabric reinforced siloxane hybrid (GFRH) film with a high haze value of 92% was fabricated by the refractive index contrast of methacrylate oligo-siloxane resin with glass-fabric. Hazy GFRH (H-GFRH) exhibited a uniform diffusion of light (diffuser sheet) as well as outstanding thermomechanical properties (polymer substrate). The synergetic advantages of the ML/QD film on H-GFRH substrate will be beneficial for the large-scale and thin white QD-BLUs in display applications.

Siloxane Hybrid Material-Encapsulated Highly Robust Flexible μLEDs for Biocompatible Lighting Applications

“…Our research team has previously reported organic–inorganic hybrid materials made by siloxane networks, which showed excellent stability against humid, thermal, mechanical, and chemical stresses. ,− The hybrid materials were made into a transparent and flexible film structure through simple curing and compressing processes. Although the hybrid material-based films have been used as dielectric layers, LED encapsulants, and nanoparticle (NP)-dispersed films, ,− their stabilities as f-μLED substrates and passivation layers have not been exploited in various harsh environments yet. Especially, our siloxane-based organic–inorganic hybrid material (SHM)-based films have been used as the encapsulants only for the bulk LED chips.…”