Pressure‐Induced Emission Luminogens Enable Optical Logic Gates toward Lighting, Scintillators and Anti‐counterfeiting

The pressure‐induced emission luminogens (PIEgens) opened the door to highly emissive materials. However, the high‐pressure phase with excellent optoelectrical properties is difficult to be stabilized at ambient conditions, seriously limiting the practical applications. Here, we firstly lighted up non‐emissive zero‐dimensional (0D) metal halide (C25H22P)2SnCl6 via pressure engineering, ultimately yielding the bright emission. Note that the quenched (C25H22P)2SnCl6 after pressure treatment of 20.0 GPa exhibited the very bright blue‐white emission. This irreversible photoluminescence (PL) transition was associated with the irreversible amorphization by increasing the potential barrier of phase transition through the steric hindrance effect. The increased distortion of inorganic octahedra and the enhanced hydrogen bond interaction within the amorphous (C25H22P)2SnCl6 after pressure treatment were responsible for the bright emission. Thus pressure‐triggered PL turn‐on behavior can serve as a robust optical switchable logic gate from the initially dark state “0” to the bright state “1”. Furthermore, the pressure‐treated (C25H22P)2SnCl6 exhibited an unexpected excitation‐dependent emission. The unique characteristic of “PIE” with different colors can be decoded the Morse code encrypted with the pressure‐treated (C25H22P)2SnCl6 and different excitations. The quenched (C25H22P)2SnCl6‐based phosphor‐converted light‐emitting diodes (pc‐LEDs), X‐ray dose rate detection and centimeter‐level patterns highlighted great potentials in lighting, display, scintillators, and anti‐counterfeiting.