biostudies-literatureYang QNational Natural Science Foundation of ChinaNational Natural Science Foundation of China (National Science Foundation of China)7778https://www.ebi.ac.uk/biostudies/studies/S-EPMC11377787biostudies-literatureUnknown15(1)Luminescent materials that simultaneously embody bright singlet and triplet excitons hold great potential in optoelectronics, signage, and information encryption. However, achieving high-performance white-light emission is severely hampered by their inherent unbalanced contribution of fluorescence and phosphorescence. Herein, we address this challenge by pressure treatment engineering via the hydrogen bonding cooperativity effect to realize the mixture of n-π*/π-π* transitions, where the triplet state emission was boosted from 7% to 40% in isophthalic acid (IPA). A superior white-light emission based on hybrid fluorescence and phosphorescence was harvested in pressure-treated IPA, and the photoluminescence quantum yield was increased to 75% from the initial 19% (blue-light emission). In-siNature communicationsBrightening triplet excitons enable high-performance white-light emission in organic small molecules via integrating n-π*/π-π* transitions.PMC1137778712274177Hattori TLi FFei YHan YYang BZou BLi KHou XYang XZhu PLiu ZZheng HZhao SYang QWang YFang LfalseBrightening triplet excitons enable high-performance white-light emission in organic small molecules via integrating n-π*/π-π* transitions.Luminescent materials that simultaneously embody bright singlet and triplet excitons hold great potential in optoelectronics, signage, and information encryption. However, achieving high-performance white-light emission is severely hampered by their inherent unbalanced contribution of fluorescence and phosphorescence. Herein, we address this challenge by pressure treatment engineering via the hydrogen bonding cooperativity effect to realize the mixture of n-π*/π-π* transitions, where the triplet state emission was boosted from 7% to 40% in isophthalic acid (IPA). A superior white-light emission based on hybrid fluorescence and phosphorescence was harvested in pressure-treated IPA, and the photoluminescence quantum yield was increased to 75% from the initial 19% (blue-light emission). In-si2024-01-01T00:00:00Z2024 Sep2025-04-05T14:38:39.102Z2025-04-05T14:38:39.102ZS-EPMC113777873923758610.1038/s41467-024-52196-7