Fig. 5: Frontier application of MPII-treated PQD-based NIR LEDs

a Schematic illustration of the application principle of NIR light sources in information storage and security. b Schematic diagram of the dot patterns printed with different inks for achieving information encryption and decryption with the assistance of MPII-treated PQD-based NIR LEDs. c, d Images of the dot patterns captured under the illumination of white LEDs and MPII-treated PQD-based NIR LEDs, respectively. e The obtained binary-coded information from Fig. 5d