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Oxoberyllates SrBeO 2 and Sr 12 Be 17 O 29 as Novel Host Materials for Eu 2+ Luminescence
Author(s) -
Strobel Philipp,
Niklaus Robin,
Schmidt Peter J.,
Schnick Wolfgang
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201801951
Subject(s) - phosphor , luminescence , crystallography , materials science , crystal structure , ternary operation , excited state , doping , light emitting diode , chemistry , optoelectronics , physics , atomic physics , computer science , programming language
Beryllate structures are marginally investigated, but show intriguing structural relations to oxo‐ and nitridosilicates. A typical feature is the coordination of Be in both trigonal planar and tetrahedral coordination by O. A broad range of structures is accessible by variable combinations of both building units. Three novel ternary Sr‐oxoberyllates are characterized by single‐crystal X‐ray diffraction analysis, density functional theory calculations and investigations on luminescence properties: α‐SrBeO 2 , β‐SrBeO 2 and Sr 12 Be 17 O 29 are obtained with oxoberyllate substructures, made up of either BeO 3 triangles or BeO 4 tetrahedra. The compounds can be described as chain‐ and layer‐type beryllates. When excited with blue light of (In,Ga)N LED chips, β‐SrBeO 2 and Sr 12 Be 17 O 29 show visible emission in the yellow and orange spectral range, respectively, upon doping with Eu 2+ . Exceptional narrow‐band yellow emission ( λ em =564 nm, fwhm=55 nm) makes β‐SrBeO 2 :Eu 2+ a promising phosphor for application in phosphor‐converted (pc‐)LEDs.