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However, the stability and density of PVD glasses with compositions typical of OLED devices are not well studied. Here, we prepared Ir(ppy)3 doped vapor-deposited glasses in three different organic semiconductor hosts; Ir(ppy)3 in a dilute concentration is often used as a light emitter in phosphorescent OLEDs. We studied these glasses during temperature ramping using spectroscopic ellipsometry and found that the Ir(ppy)3 doped PVD glasses have high kinetic stability and high density. Surprisingly, the observed kinetic stability exceeds that of single-component PVD glasses. This work allows further understanding of the material properties influencing OLED performance, thus facilitating the design of durable and stable devices.<\/jats:p>","DOI":"10.1063\/5.0287781","type":"journal-article","created":{"date-parts":[[2025,9,22]],"date-time":"2025-09-22T11:53:57Z","timestamp":1758542037000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["High kinetic stability and high density of Ir(ppy)3 doped organic semiconductor glasses"],"prefix":"10.1063","volume":"163","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0179-395X","authenticated-orcid":false,"given":"Yejung","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Chemistry, University of Wisconsin-Madison 1 , Madison, Wisconsin 53706,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5615-8646","authenticated-orcid":false,"given":"Shinian","family":"Cheng","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Wisconsin-Madison 1 , Madison, Wisconsin 53706,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4253-5658","authenticated-orcid":false,"given":"Lian","family":"Yu","sequence":"additional","affiliation":[{"name":"School of Pharmacy, University of Wisconsin-Madison 2 , Madison, Wisconsin 53705,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4715-8473","authenticated-orcid":false,"given":"M. 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