Highly effective synthesis and photoluminescence of Sr2Si5N8:Eu2+ red-emitting phosphor for LEDs

Abstract

We developed a highly effective and self-sustaining route for synthesizing Sr(2)Si(5)N(8):Eu(2+) red-emitting phosphor particles for use in light emitting diodes (LEDs). The phosphors thus synthesized showed excellent emission characteristics under a blue excitation wavelength of 450 nm, had a uniform particle size distribution, and showed high performance in LED packages.

Carbothermal synthesis of CaAlSiN3:Eu2+ red-emitting phosphors and the photoluminescent properties

“…Alternatively, red phosphors ranging from sulfides, silicates to nitrides were widely employed in fabricating white LEDs to compensate red component, especially for those well-known nitrides red phosphors with high luminous efficiency and outstanding thermal stability, such as (Ca, Sr, Ba) 2 Si 5 N 8 :Eu 2? [4,5], (Ca, Sr)AlSiN 3 :Eu 2? [6,7] and (Ca, Sr) LiAl 3 N 4 :Eu 2?…”

“…yellow emitting phosphor was reported by Zhang et al [17] with carbothermal route using SrCO 3 and CeO 2 as raw materials. Comparing with other synthetic routes (such as, solid-state reaction, ammonothermal method and combustion technique) [4,18,19], carbothermal synthesis was identified as a facile route for preparation of nitrides phosphors by considering of its outstanding advantages in relative low reaction temperature (1400-1600°C), cheap raw materials (oxides or carbonates, SrCO 3 , CaCO 3 , Eu 2 O 3 ) and simple processing [20][21][22]. As one of significant nitride phosphor, CaAlSiN 3 :Eu 2?…”

A red-emitting perovskite-type SrLa(1−)MgTaO6:xEu3+ for white LED application

“…Presently, the red phosphor for white LEDs can be excited by near ultraviolet (NUV) or blue chips [5,6]. However, the current red phosphors of sulfides and phosphates suffer from poor efficiency and chemical stability, or need strict synthesis conditions [7].…”

Facile synthesis and spectroscopic characterization of siliconitride phosphors for white light‐emitting diodes

“…Nitridosilicate‐based M 2 Si 5 N 8 :Eu 2+ (M = Ca, Sr, Ba) phosphors are considered to be the significant for white LEDs as red‐light emitting materials with low thermal quenching owing to the strong crystal fields and covalent nature . However, the emission color can be tuned from red to yellow after codoping of Ce 3+ ions in Sr 2 Si 5 N 8 : Eu 2+ host based on the concept of energy transfer . The combination of such kind of phosphors with blue LED chips is possible to produce white light.…”