11,12-Dihydroindolo[2,3-a]carbazole is an isomer of indole[3,2-b]carbazole. 11,12-Dihydroindolo[2,3-a]carbazole derivatives have good planarity, high thermal stability, and excellent photophysical properties. As an optoelectronic material, it is often used to synthesize TADF-OLED body and emission layer materials and as a pharmaceutical intermediate to synthesize anticancer drugs[1-3]. Chemical sensors based on indole[2,3-a]carbazole can be used to detect Cu2+ and Fe3+ in environmental and biological systems simultaneously[4]. Compared to other metal ions, the sensor has specificity and high sensitivity for the detection of Cu2+ and Fe3+ ions. For Cu2+ and Fe3+ ions, detection limits are as low as 2.93×10 -7 M and 4.10×10 -7 M.