Homoleptic imidazolate frameworks [Sr(1-x)Eu(x)(Im)2]--hybrid materials with efficient and tuneable luminescence.
Homoleptic frameworks of the formula [Sr(1-x)Eu(x)(Im)(2)] (1) (x = 0.01-1.0; Im(-) = imidazolate anion, C(3)H(3)N(2)(-)) are hybrid materials that exhibit an intensive green luminescence. Tuning of both emission wavelength and quantum yield is achieved by europium/strontium substitution so that a QE of 80% is reached at a Eu content of 5%. Even 100% pure europium imidazolate still shows 60% absolute quantum efficiency. Substitution of Sr/Eu shows that doping with metal cations can also be utilized for coordination compounds to optimize materials properties. The emission is finely tuneable in the region 495-508 nm via variation of the europium content. The series of frameworks [Sr(1-x)Eu(x)(Im)(2)] presents dense MOFs with the highest quantum yields reported for MOFs so far.
Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13(D), 81377 München, Germany.
Alexander
A
Zurawski
Marit
M
Mai
Dominik
D
Baumann
Claus
C
Feldmann
Klaus
K
Müller-Buschbaum
D018360:Crystallography, X-Ray; D005063:Europium / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D049449:Luminescence; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011789:Quantum Theory; D013324:Strontium / Q000737:chemistry*
D007093:Imidazoles; D009942:Organometallic Compounds; D005063:Europium; D013324:Strontium