Used as a photostabilizer in organic light-emitting diode (OLED) devices, particularly in blue-emitting layers. It helps improve device lifetime by suppressing degradation caused by light and heat. The mixture of Bt1 and Bt2 isomers enhances performance stability in display and lighting applications due to effective triplet energy management and hole-transport properties. Commonly found in advanced emissive layers where high efficiency and long operational stability are required.