Narrow-Band Green Emitting Nitridolithoalumosilicate Ba[Li-2(Al2Si2)N-6]:Eu2+ with Framework Topology whj for LED/LCD-Backlighting Applications

作者：Strobel Philipp; Schmiechen Sebastian; Siegert Markus; Tuecks Andreas; Schmidt Peter J; Schnick Wolfgang^*

来源：Chemistry of Materials, 2015, 27(17): 6109-6115.

DOI：10.1021/acs.chemmater.5b02702

Eu2+- as well as Ce3+-doped Ba[Li-2(Al2Si2)N-6] and its related Mg-substituted compounds Ba[(Mg2-xLix) (Al4-xSix)N-6]:Eu2+ (x = 0-2) with x = 1.6, 1.8 have been synthesized by metathesis reactions in tantalum ampules. Crystal structures were solved and refined from single-crystal X-ray diffraction data. All three compounds crystallize in tetragonal space group P4/ncc (no. 130) (Z = 4, Ba[Li-2(Al2Si2)N-6]:Eu2+: a = 7.8282(4), c = 9.9557(5) angstrom, R1 = 0.0144, wR2 = 0.0366). Their crystal structures, exhibiting the novel framework topology whj, consist of a highly condensed anionic tetrahedra network of disordered (Li/Mg)N-4 and (Al/Si)N-4 units connected to each other by common edges and corners. The degree of condensation (i.e., atomic ratio (Al,Li,Mg,Si):N) is kappa = 1. The Ba2+-position is coordinated eight-fold by N3- in form of a truncated square pyramid. Upon doping with Eu2+, narrow-band emission in the green to yellow spectral range is observed (lambda(em) = 532-562 nm, fwhm approximate to 1962 cm(-1)). Ce3+-doped crystals of Ba[Li-2(Al2Si2)N-6] show blue emission (lambda(em) = 468; 507 nm). According to the tunability of the narrow-band green emission, application in LED-backlight liquid crystal displays appears promising.

• 出版日期2015-9-8