Use of Versatile Binaphthalene Derivative in Chromatic-Stability Non-Doped White Organic Light Emitting Diodes

We have investigated the properties of the ultra-thin layer all-fluorescent nondoped white organic light emitting diodes based on blue-emitting binaphthalene derivative (BN) and ultra-thin green and red emitters. By optimizing the thickness of BN, we found that the device exhibited a high color rendering index (CRI) of 84 and high chromatic-stability with the Commission International de L’Eclairage coordinates shifting from (0.26, 0.32) to (0.27, 0.33) as the luminance increased from 40 to 10645 cd/m2. In addition, we also achieved a low current efficiency roll-off, which current efficiency only reduced from 3.77 cd/A to 3.36 cd/A when the current density increased from 13 mA/cm2 to 104 mA/cm2. High CRI and low efficiency roll-off are of significance for the applications of organic light-emitting diodes in display and lighting.