Near-infrared (NIR) light has various applications, such as in cameras and sensors. Organic light-emitting diodes (OLEDs), which are characterized by their thinness, lightweight, and flexibility, have potential application in various devices requiring light emission in the NIR region. In this study, we focused on the wavelength range of 700–1000 nm, which is called the “first optical window” in NIR light. Furthermore, we investigated the optical properties of a low-molecular-weight boron-dipyrromethene derivative (BODIPY-Ph), which has been reported to possess NIR absorption properties as well as the luminescence properties of BODIPY-Ph-based OLEDs in the NIR region. An acetone solution of BODIPY-Ph showed 52.3% photoluminescence quantum yield and the apparent external quantum efficiency of the OLED in the NIR region was high at 1.87%, which is one of the highest values when using OLEDs that are metal-free and use pure fluorescence emission without using triplet.

近红外 (NIR) 光具有多种应用，例如在相机和传感器中。有机发光二极管 (OLED) 具有薄、轻和柔韧性等特点，在需要在 NIR 区域发光的各种器件中具有潜在应用。在这项研究中，我们专注于 700-1000 nm 的波长范围，这被称为 NIR 光中的“第一光学窗口”。此外，我们研究了低分子量硼二吡咯亚甲基衍生物 (BODIPY-Ph) 的光学性质，据报道该衍生物具有 NIR 吸收特性以及基于 BODIPY-Ph 的 OLED 在 NIR 区域的发光特性. BODIPY-Ph 的丙酮溶液显示出 52.3% 的光致发光量子产率，OLED 在 NIR 区域的表观外量子效率高达 1.87%，