Research Advances Tunable Organic Emitters for Future Lighting
Using a self-driving laboratory, researchers have developed a new class of tunable and soluble organic emitters for solid-state lasers. This materials science breakthrough has direct implications for future LED and OLED lighting technologies. The advance could lead to more energy-efficient, color-tunable, and sustainable light sources with potential for greater miniaturization.
- This advance in organic emitters builds on a foundation of human-centric lighting research, which focuses on the non-visual effects of light to support wellbeing. The discovery of intrinsically photosensitive retinal ganglion cells (ipRGCs) in the retina, which are crucial for synchronizing circadian rhythms, has been a key driver in this field. - The WELL Building Standard v2 is a key driver for the adoption of tunable lighting, specifying required light levels in Equivalent Melanopic Lux (EML) at different times of day to support circadian health. For example, it calls for at least 150 EML for a minimum of four hours per day from electric light alone in certain spaces. - For integration into building automation, the DALI (Digital Addressable Lighting Interface) protocol is critical. The DALI Alliance has introduced DALI+, a new brand for DALI over wireless and IP-based networks, enhancing its flexibility for IoT applications and allowing it to connect with broader building management systems. - In terms of sustainability, the lighting industry is increasingly adopting circular economy principles, focusing on designing luminaires for disassembly, component reuse, and material recycling to minimize waste and extend product lifecycles. This approach also reduces embodied carbon, a key metric in sustainable building. - Architectural and design publications like *Dezeen* frequently highlight aesthetic innovation in lighting, showcasing new forms and material uses. Recent examples from Milan Design Week include Ronan Bouroullec's "Luce Sferica" for Flos, which features mouth-blown glass spheres, and Michael Anastassiades' "Linked" lights, which create vertical lines of illuminated glass rope. - Tunable white lighting systems typically use two or more sets of LEDs with different color temperatures—such as a warm-white around 2700K and a cool-white between 5000K and 6500K—which are then mixed to create a range of color temperatures. This technology is seeing increased use in schools, healthcare settings, and retail to improve focus, regulate biological clocks, and enhance product appearance. - The development of organic solid-state lasers (OSSLs), a related field, has faced challenges in achieving continuous-wave operation and device longevity, which has slowed commercial adoption. However, their potential for creating compact, low-cost, and broadly tunable coherent light sources continues to drive research.
