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We demonstrate that a simple twist interface between two single-crystalline bulks of hexagonal boron nitride (hBN) creates moir\u00e9 quantum wells (QWs) embedded in a three-dimensional vdW structure. hBN moir\u00e9 QWs strongly confine charge carriers under both optical excitation and electrical injection. Despite their indirect bandgap, they emit intense deep-ultraviolet luminescence in the extreme wavelength bands from 215 to 240 nanometers, exceeding that of state-of-the-art conventional aluminum gallium nitride (AlGaN) multiple QWs by more than an order of magnitude. Furthermore, the twist angle control allows wide tunability of luminescence energy and efficiency in moir\u00e9 QWs.<\/jats:p>","DOI":"10.1126\/science.aeb2095","type":"journal-article","created":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T18:01:27Z","timestamp":1773943287000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":9,"title":["Highly efficient, deep-ultraviolet luminescence in hBN moir\u00e9 quantum wells"],"prefix":"10.1126","volume":"391","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8483-5755","authenticated-orcid":true,"given":"Chengyun","family":"Hong","sequence":"first","affiliation":[{"name":"Center for van der Waals Quantum Solids, Institute for Basic Science (IBS), Pohang, Republic of Korea."},{"name":"Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7355-7406","authenticated-orcid":true,"given":"Fangzhou","family":"Zhao","sequence":"additional","affiliation":[{"name":"Theory Department, Max Planck Institute for Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Hamburg, Germany."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Su-Beom","family":"Song","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sangho","family":"Yoon","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-7728-2458","authenticated-orcid":true,"given":"Seong-Joon","family":"Jeon","sequence":"additional","affiliation":[{"name":"Center for van der Waals Quantum Solids, Institute for Basic Science (IBS), Pohang, Republic of Korea."},{"name":"Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5171-6215","authenticated-orcid":true,"given":"M. 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