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Herein, a robust purely organic RTP molecule, 3,6\u2010bis(5\u2010phenylindolo[3,2\u2010a]carbazol\u201012(5H)\u2010yl)\u2010xanthen\u20109\u2010one (3,2\u2010PIC\u2010XT), is developed. The neat film of 3,2\u2010PIC\u2010XT shows strong green RTP with a very short lifetime (2.9\u2005\u03bcs) and a high photoluminescence quantum yield (72\u2009%), and behaviors balanced bipolar charge transport. The RTP nature of 3,2\u2010PIC\u2010XT is validated by steady\u2010state and transient absorption and emission spectroscopies, and the working mechanism is deciphered by theoretical simulation. Non\u2010doped multilayer OLEDs using thin neat films of 3,2\u2010PIC\u2010XT furnish an outstanding external quantum efficiency (EQE) of 24.91\u2009% with an extremely low roll\u2010off (1.6\u2009%) at 1000\u2005cd\u2009m\n                    <jats:sup>\u22122<\/jats:sup>\n                    . High\u2010performance non\u2010doped top\u2010emitting and tandem OLEDs are also achieved, providing remarkable EQEs of 24.53\u2009% and 42.50\u2009%, respectively. Delightfully, non\u2010doped simplified OLEDs employing thick neat films of 3,2\u2010PIC\u2010XT are also realized, furnishing an excellent EQE of 17.79\u2009% and greatly enhanced operational lifetime. The temperature\u2010dependent and transient EL spectroscopies demonstrate the electrophosphorescence attribute of 3,2\u2010PIC\u2010XT. These non\u2010doped OLEDs are the best devices based on purely organic RTP materials reported so far.\n                  <\/jats:p>","DOI":"10.1002\/anie.202405418","type":"journal-article","created":{"date-parts":[[2024,4,30]],"date-time":"2024-04-30T07:39:09Z","timestamp":1714462749000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":75,"title":["Purely Organic Room\u2010Temperature Phosphorescence Molecule for High\u2010Performance Non\u2010Doped Organic Light\u2010Emitting Diodes"],"prefix":"10.1002","volume":"63","author":[{"given":"Xiaoluo","family":"Peng","sequence":"first","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peng","family":"Zou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiajie","family":"Zeng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xing","family":"Wu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dian","family":"Xie","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Fu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dezhi","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongge","family":"Ma","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ben Zhong","family":"Tang","sequence":"additional","affiliation":[{"name":"School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong Kong, Shenzhen  Guangdong 518172 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0618-6024","authenticated-orcid":false,"given":"Zujin","family":"Zhao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,6,10]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.98799"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.201301750"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1039\/c3sc22107e"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.124258"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1038\/ncomms6008"},{"key":"e_1_2_7_6_1","doi-asserted-by":"crossref","unstructured":"Lee H.-F. 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