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By incorporating bulky\n                    <jats:italic>tert<\/jats:italic>\n                    \u2010butylcarbazole (tBuCz) units into tridentate N\u2010heterocyclic carbene ligands, the molecular geometry is sterically confined into a more coplanar and anisotropic configuration. This structural planarization increases exciton binding energy and shortens the radiative lifetime, thereby stabilizing bound excitons against thermally activated dissociation while accelerating radiative exciton consumption. At the same time, the enhanced geometric anisotropy induces a highly horizontal emitting dipole orientation (EDO) of approximately 95%, enabling efficient intrinsic light extraction. Beyond its role as an emitter, the planarized Ir(III) complex further has a cooperative alignment effect in hyper\u2010OLED architectures. This structural and electrostatic templating effect transfers molecular alignment to the terminal multiple\u2010resonance TADF emitter\n                    <jats:italic>v<\/jats:italic>\n                    \u2010DABNA, leading to secondary dipole ordering with an EDO of 98%. As a result, the optimized blue hyper\u2010OLED achieves ultra\u2010narrow emission at 470\u00a0nm with a full width at half maximum of 22\u00a0nm, a maximum external quantum efficiency of 36.9%, and an operational lifetime (LT\n                    <jats:sub>50<\/jats:sub>\n                    , time to 50% initial luminance) of 446\u00a0h at 1000\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    . These results establish spatial planarization as a powerful molecular design principle for coupling exciton stabilization, dipole orientation control, and interfacial alignment transfer, providing a general strategy for efficient and stable blue OLEDs.\n                  <\/jats:p>","DOI":"10.1002\/adma.74617","type":"journal-article","created":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T11:50:51Z","timestamp":1787745051000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Spatial Planarization Controls Optical Anisotropy for Efficient and Stable Blue\u2010Emitting OLEDs"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8204-9961","authenticated-orcid":false,"given":"Chengcheng","family":"Wu","sequence":"first","affiliation":[{"name":"Institute of Materials Research Tsinghua Shenzhen International Graduate School Tsinghua University  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-7126-0787","authenticated-orcid":false,"given":"Kai\u2010Ning","family":"Tong","sequence":"additional","affiliation":[{"name":"Institute of Materials Research Tsinghua Shenzhen International Graduate School Tsinghua University  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuan","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Materials Research Tsinghua Shenzhen International Graduate School Tsinghua University  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manli","family":"Huang","sequence":"additional","affiliation":[{"name":"Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and Engineering Shenzhen University  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiazhi","family":"Meng","sequence":"additional","affiliation":[{"name":"Institute of Materials Research Tsinghua Shenzhen International Graduate School Tsinghua University  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan\u2010Lin","family":"Xu","sequence":"additional","affiliation":[{"name":"Macao Institute of Materials Science and Engineering (MIMSE) MUST\u2010SUDA Joint Research Center for Advanced Functional Materials Zhuhai MUST Science and Technology Research Institute Macau University of Science and Technology  Taipa Macau P. 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R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Man\u2010Keung","family":"Fung","sequence":"additional","affiliation":[{"name":"Macao Institute of Materials Science and Engineering (MIMSE) MUST\u2010SUDA Joint Research Center for Advanced Functional Materials Zhuhai MUST Science and Technology Research Institute Macau University of Science and Technology  Taipa Macau P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8433-6200","authenticated-orcid":false,"given":"Dongdong","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University  Beijing P. R. 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