Common Characteristics of Materials Exhibiting Photoinduced Blackbody Behavior

Abstract Under intense light exposure, certain white objects can exhibit broadband electromagnetic wave absorption similar to a traditional blackbody, a phenomenon termed photoinduced blackbody. However, not all materials can achieve this state—only those satisfying two critical conditions: 1) white‐light emission under intense illumination and 2) the presence of cations with d‐orbital electrons. In high‐intensity light fields, d‐orbital electrons facilitate high‐frequency vibrational coupling among cations, anions, and electrons. This interaction enables broadband electromagnetic wave absorption and radiation via transitions that bypass conventional selection rules. Photodynamic analyses demonstrate that broadband optical absorption occurs within 1 ms, while white‐light emission emerges after 4 ms and sustains in a temperature‐dependent manner. These results suggest that photoexcitation induces forced vibrational states, with radiative transitions initially localized to the excitation wavelength range before rapidly broadening to full‐spectrum coverage.