“…Over 17 years, extensive studies on PIPT have accumulated, and realistic examples have been reported for various materials, such as charge transfer (CT) crystals, [3][4][5][6][7][8][9] conjugated polymers, 10,11) transition metal-oxides, [12][13][14] spin crossover complexes, [15][16][17][18][19] Prussian-blue analogs, 20) the quantum structure of diluted magnetic semiconductors, 21) low-dimensional transition metal organo complexes, 22) and A 2 B molecular crystals. [23][24][25] In all examples, it is an essential and common concept to utilize the intrinsic instability of electronic, magnetic, and structural properties due to cooperative interaction to enhance the photoresponse.…”