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The present work describes a phosphor-Up-converted WLED approach that wishes to overcome this issue by achieving white light generation (WLG) through Up-conversion photoluminescence (UCPL), without energy losses due to Stokes shift and excited by a 980\u2009nm LED instead of the more expensive blue LEDs. The UC materials include thin films of lanthanide (Ln)-doped aluminosilicate glass multilayers, alternating (Ln)-doped aluminosilicate and titania films in the form of 1-D photonic crystals and Ln ion-implanted materials. Sol-gel (SG) processing has been used as a low-cost high purity processing method to prepare titania, as well as aluminosilicate films containing Er<jats:sup>3+<\/jats:sup>, Tm<jats:sup>3+<\/jats:sup> and Yb<jats:sup>3+<\/jats:sup>, for WLG and possible application as WLED materials. The total Ln content varied from a high of 22\u2009mol% to as low as 5.8\u2009mol%. The materials prepared have been characterized by UV-Vis-NIR (using a variable angle specular reflection accessory), plus FTIR and UCPL spectroscopies. The UC light emission was analyzed with the help of CIE chromaticity diagrams.<\/jats:p>\n                <jats:p><jats:bold>Graphical abstract<\/jats:bold><\/jats:p>","DOI":"10.1007\/s10971-024-06577-5","type":"journal-article","created":{"date-parts":[[2024,10,9]],"date-time":"2024-10-09T03:32:12Z","timestamp":1728444732000},"page":"56-62","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Up-conversion materials for solid-state lighting"],"prefix":"10.1007","volume":"113","author":[{"given":"Rui M.","family":"Almeida","sequence":"first","affiliation":[]},{"given":"E.","family":"Alves","sequence":"additional","affiliation":[]},{"given":"Lu\u00eds F.","family":"Santos","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2024,10,9]]},"reference":[{"issue":"9","key":"6577_CR1","doi-asserted-by":"publisher","first-page":"1727","DOI":"10.1002\/pssa.200520045","volume":"202","author":"R Mueller-Mach","year":"2005","unstructured":"Mueller-Mach R, Mueller G, Krames MR, H\u00f6ppe HA, Stadler F, Schnick W, Juestel T, Schmidt P(2005) Highly efficient all-nitride phosphor-converted white light emitting diode Phys Status Solidi 202(9):1727\u20131732. https:\/\/doi.org\/10.1002\/pssa.200520045","journal-title":"Phys Status Solidi"},{"issue":"4","key":"6577_CR2","doi-asserted-by":"publisher","first-page":"180","DOI":"10.1038\/nphoton.2009.32","volume":"3","author":"S Pimputkar","year":"2009","unstructured":"Pimputkar S, Speck JS, DenBaars SP, Nakamura S (2009) Prospects for LED lighting. 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