Color‐Tunable Organic Light‐Emitting Displays for Interactive Multi‐Signal Visualization

Abstract Optoelectronic devices integrated with multiple functions for interactive signal visualization have become increasingly important in the intelligent era. Here, a color‐tunable organic light‐emitting diode (CTOLED) is developed to achieve a user‐interaction intelligent device that enables multicolor visualization of infrared light and temperature distribution via the modulation with a multi‐stimuli responsive silicon (Si) sensor for the first time. The key to the color‐tunable functionality of the CTOLED is an ultrathin exciton‐blocking layer between different emitting layers, which leads to the quantitative correlation of driving current and emitted visible color. As a result, the user can manipulate the silicon/color‐tunable organic light‐emitting diode (Si/CTOLED) device through the infrared pen, and the “writing” spatial information and the infrared intensity can influence the display patterns and colors. Besides, the temperature is sensed by the flexible Si/CTOLED device and is displayed in corresponding different colors, which is promising as a wearable temperature visualization monitor and directly interact with a user. The temperature monitor exhibits ultrasensitivity with a low minimum distinguishable temperature difference of only 65 mK. The Si/CTOLED devices open new possibilities for the development of intelligent devices and have promising multi‐disciplinary applications.