Chasing Down the Eu2+ Ions: The Delicate Structure−Property Relationships in the Ultra‐Narrow Band Phosphor K1.6Na2.1Li0.3[Li3SiO4]4:Eu2+

• DOI: 10.1002/adom.202101643
• Publication Date: 2021-10-10T13:20:48Z
• Authors: Freia Ruegenberg; Amador García‐Fuente; Markus Seibald; Dominik Baumann; Simon Peschke; Werner Urland; Andries Meijerink; Hubert Huppertz; Markus Suta
• Keywords: Cyan

Abstract Eu 2+ ‐activated phosphors of the UCr 4 C structure type have emerged as promising new (ultra‐)narrow band phosphors. Especially ‐type alkali lithosilicates caused a sensation in field phosphor research recent years due to their consistent (ultra)narrow‐band luminescence cyan and green range that can pave way novel backlighting LEDs with high color gamut. The compound “K 2 Na [Li 3 SiO ] :Eu ” stands out strikingly narrow emission (<0.2 eV or <30 nm full width at half maximum energy wavelength scale, respectively) but position ions within this has been so far controversial. High‐resolution photoluminescence spectroscopy 10 K reveals complex spectrum seven bands violet range. Combination single‐crystal X‐ray diffraction (SCXRD) demonstrates cation channels also contain Li + ions. presence blue spectral occupy available sites independently confirmed by advanced ligand calculations. This study combination SCXRD, spectroscopy, theory help elucidate structural problems.