Narrow-Band Green Emitting Nitridolithoalumosilicate Ba[Li<inf>2</inf>(Al<inf>2</inf>Si<inf>2</inf>)N<inf>6</inf>]:Eu<sup>2+</sup> with Framework Topology whj for LED/LCD-Backlighting Applications

  • Strobel P
  • Schmiechen S
  • Siegert M
 et al. 
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Abstract

Eu2+- as well as Ce3+-doped Ba[Li2(Al2Si2)N6] and its related Mg-substituted compounds Ba[(Mg2?xLix) (Al4?xSix)N6]: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[Li2(Al2Si2)N6]:Eu2+: a = 7.8282(4), c = 9.9557(5) Å, 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)N4 and (Al/Si)N4 units connected to each other by common edges and corners. The degree of condensation (i.e., atomic ratio (Al,Li,Mg,Si):N) is ? = 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 (?em = 532?562 nm, fwhm ≈ 1962 cm?1). Ce3+-doped crystals of Ba[Li2(Al2Si2)N6] show blue emission (?em = 468; 507 nm). According to the tunability of the narrow-band green emission, application in LED-backlight liquid crystal displays appears promising.
Eu2+- as well as Ce3+-doped Ba[Li2(Al2Si2)N6] and its related Mg-substituted compounds Ba[(Mg2?xLix) (Al4?xSix)N6]: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[Li2(Al2Si2)N6]:Eu2+: a = 7.8282(4), c = 9.9557(5) Å, 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)N4 and (Al/Si)N4 units connected to each other by common edges and corners. The degree of condensation (i.e., atomic ratio (Al,Li,Mg,Si):N) is ? = 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 (?em = 532?562 nm, fwhm ≈ 1962 cm?1). Ce3+-doped crystals of Ba[Li2(Al2Si2)N6] show blue emission (?em = 468; 507 nm). According to the tunability of the narrow-band green emission, application in LED-backlight liquid crystal displays appears promising.

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Authors

  • Peter SchmidtLumileds Germany GmbH

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  • Philipp Strobel

  • Sebastian Schmiechen

  • Markus Siegert

  • Andreas Tücks

  • Wolfgang Schnick

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