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Nonetheless, how the chemical structures of dopants and matrices systematically influence the triplet exciton dynamics of solid\u2010state materials remains elusive. Although investigations have been focusing on electronic structures and energy levels, here we show that doped phenothiazine model systems largely follow the well\u2010known principle of \u201c\n                    <jats:italic>like dissolves like<\/jats:italic>\n                    \u201d and exhibit phase\u2010separation\u2010controlled photophysical state switching between RTP and triplet\u2010triplet annihilation delayed fluorescence (TTA\u2010DF), evidenced by scanning electron microscopy, confocal microscopy, and microregion spectrometry. In the structurally similar host\u2013guest combination, the miscible solid solution exhibits strong guest RTP emission; in the thermodynamically favored microphase\u2010separated state, the RTP is severely outcompeted by TTA\u2010DF of the guest aggregate, which has significantly faster decay kinetics. Microscopy results show that simple mechanical force by gentle grinding is sufficient to partially amorphize the nanophase\u2010separated crystalline sample and promote intense host\u2010sensitized guest RTP. This work demonstrates that, in addition to quantum mechanical considerations, thermodynamic rules provide the crucial missing link to predictably govern structural morphology and macroscopic luminescence in doped organic crystals, laying a more complete foundation for the design of dynamically tunable, stimuli\u2010responsive RTP materials.\n                  <\/jats:p>","DOI":"10.1002\/anie.4780761","type":"journal-article","created":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T13:52:49Z","timestamp":1789739569000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effect of Structural Similarity Between Dopants and Matrices in Organic Room\u2010Temperature Phosphorescence Materials: \u201cLike Dissolves Like\u201d"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-1812-7934","authenticated-orcid":false,"given":"Taiyuan","family":"Li","sequence":"first","affiliation":[{"name":"Hefei 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