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Herein, a new phosphor belonging to the substance class of alkali metal lithosilicates with the generalized sum formula Cs<jats:sub>4\u2212<jats:italic>x<\/jats:italic>\u2212<jats:italic>y<\/jats:italic>\u2212<jats:italic>z<\/jats:italic><\/jats:sub>Rb<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>Na<jats:sub><jats:italic>y<\/jats:italic><\/jats:sub>Li<jats:sub><jats:italic>z<\/jats:italic><\/jats:sub>[Li<jats:sub>3<\/jats:sub>SiO<jats:sub>4<\/jats:sub>]<jats:sub>4<\/jats:sub>:Eu<jats:sup>2+<\/jats:sup> is reported. Single crystals of the cyan\u2010emitting UCr<jats:sub>4<\/jats:sub>C<jats:sub>4<\/jats:sub>\u2010type phosphor show a peculiar double\u2010band luminescence with one ultranarrow emission band at 473\u2005nm and a narrow emission band at 531\u2005nm under excitation with UV light (<jats:italic>\u03bb<\/jats:italic><jats:sub>exc<\/jats:sub>=408\u2005nm). Regarding occupation of the channels by the light metal ions, investigations of single\u2010crystal XRD data led to the assumption that domain formation with distinct lithium\u2010 and sodium\u2010filled channels occurs. Depending on which of these channels hosts the activator ion Eu<jats:sup>2+<\/jats:sup>, a green or blue emission results. The herein\u2010presented results shed new light on the luminescence process in the well\u2010studied UCr<jats:sub>4<\/jats:sub>C<jats:sub>4<\/jats:sub>\u2010type alkali metal lithosilicate phosphors.<\/jats:p>","DOI":"10.1002\/chem.201904526","type":"journal-article","created":{"date-parts":[[2019,11,11]],"date-time":"2019-11-11T17:04:10Z","timestamp":1573491850000},"page":"2204-2210","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["A Double\u2010Band Emitter with Ultranarrow\u2010Band Blue and Narrow\u2010Band Green Luminescence"],"prefix":"10.1002","volume":"26","author":[{"given":"Freia","family":"Ruegenberg","sequence":"first","affiliation":[{"name":"Institute of General, Inorganic and Theoretical Chemistry University of Innsbruck  Innrain 80\u201382 6020 Innsbruck Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Markus","family":"Seibald","sequence":"additional","affiliation":[{"name":"OSRAM Opto Semiconductors GmbH  Mittelstetter Weg 2 86830 Schwabm\u00fcnchen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominik","family":"Baumann","sequence":"additional","affiliation":[{"name":"OSRAM Opto Semiconductors GmbH  Mittelstetter Weg 2 86830 Schwabm\u00fcnchen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Simon","family":"Peschke","sequence":"additional","affiliation":[{"name":"OSRAM Opto Semiconductors GmbH  Mittelstetter Weg 2 86830 Schwabm\u00fcnchen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp C.","family":"Schmid","sequence":"additional","affiliation":[{"name":"OSRAM Opto Semiconductors GmbH  Mittelstetter Weg 2 86830 Schwabm\u00fcnchen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2098-6087","authenticated-orcid":false,"given":"Hubert","family":"Huppertz","sequence":"additional","affiliation":[{"name":"Institute of General, Inorganic and Theoretical Chemistry University of Innsbruck  Innrain 80\u201382 6020 Innsbruck Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,1,21]]},"reference":[{"key":"e_1_2_7_1_1","unstructured":"\u00a0"},{"key":"e_1_2_7_2_2","doi-asserted-by":"publisher","DOI":"10.1038\/nmat4270"},{"key":"e_1_2_7_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/lpor.201600147"},{"key":"e_1_2_7_4_2","doi-asserted-by":"publisher","DOI":"10.1021\/acsenergylett.8b01408"},{"key":"e_1_2_7_5_2","doi-asserted-by":"publisher","DOI":"10.1021\/jz2002452"},{"key":"e_1_2_7_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.mser.2010.07.001"},{"key":"e_1_2_7_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.pmatsci.2016.09.007"},{"key":"e_1_2_7_8_2","doi-asserted-by":"publisher","DOI":"10.1039\/C6DT01230B"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1755025"},{"key":"e_1_2_7_10_1","unstructured":"\u00a0"},{"key":"e_1_2_7_11_2","doi-asserted-by":"publisher","DOI":"10.1063\/1.1935027"},{"key":"e_1_2_7_12_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.stam.2007.08.005"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1149\/1.2173192"},{"key":"e_1_2_7_14_1","unstructured":"\u00a0"},{"key":"e_1_2_7_15_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-3697(00)00194-3"},{"key":"e_1_2_7_16_2","doi-asserted-by":"publisher","DOI":"10.1002\/pssa.200520045"},{"key":"e_1_2_7_17_2","doi-asserted-by":"publisher","DOI":"10.1002\/pssa.200669576"},{"key":"e_1_2_7_18_2","unstructured":"M. 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