Abstract
We report a metal-free bpy-bridged silsesquioxane displaying an efficient and tuneable blue-to-green emission (maximum quantum yield and luminance values of 0.22 ± 0.02 cd m–2 and 63 ± 3 cd m–2, respectively) when excited by commercial InGaN light emitting diodes (LEDs) (385–405 nm). This is the highest quantum yield value reported so far for metal-free phosphors easily excited by commercial InGaN long-UV/blue LEDs bringing organic/inorganic hybrids on the way to applications as metal-free phosphors for smart LED-based lighting and LED-addressed displays.