Synthesis and characterization of YAG:Ce,Gd and YAG:Ce,Gd/PMMA nanocomposites for optoelectronic applications

Abstract

A sol-gel method was developed to obtain cerium-, gadolinium-(co)activated yttrium aluminum garnet (YAG:Ce,Gd) phosphor. The composite was obtained by incorporating YAG:Ce,Gd powder in poly(methyl methacrylate) (PMMA) matrix in the presence of tetrahydrofuran (THF). Sample characterization was performed using Fourier transform infrared spectrometry, X-ray diffraction, energy dispersive X-ray spectroscopy, field emission scanning electron microscopy, and fluorescence spectroscopy. Results showed a garnet pure phase at 1000 C, a nanoscale phosphor with spherical morphology and a good dispersion in PMMA matrix without structural modification of YAG:Ce,Gd in the composite. This type of phosphor can be used for all commercial blue chips and YAG:Ce,Gd/PMMA composite is a good candidate for white light-emitting devices.

Sol–gel synthesis, characterization and study of substitution effects in different gallium-containing garnets

“…The most popular garnet is yttrium aluminium garnet (Y 3 Al 5 O 12 , YAG) which possesses good thermal, chemical stability and doped with transition metal or lanthanide ions could be employed as the host material for multi-coloured phosphors [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. By selecting corresponding lanthanide ions may be produced red, green and blue (RGB) emission for use in tricolour white light [25][26][27].…”

Assessment of Crystalline Materials for Solid State Lighting Applications: Beyond the Rare Earth Elements

“…The shift of the PL bands can be interpreted by a variation of the crystalline field due to modifications of the reticular parameters associated with the presence of different elements in the A and B position of the general A 3 B 5 O 12 (A = Y and B = Al in YAG). Some examples are related to the substitution of Al by Ga or Sc as well as the substitution of Y with Gd [49,50]. Substitution of Al 3+ by a combination of Mg 2+ and Si 4+ leads to a considerable shift of the emission maximum to 600 nm, allowing the fabrication of a warm-white LED with relatively high color rendering [51].…”

Enhanced XRF Methods for Investigating the Erosion-Resistant Functional Coatings

“…The SEM measurements were carried out by means of an Apreo instrument (Thermo Scientific, Waltham, MA, USA), which produces enlarged images of a variety of specimens, achieving magnification of over 100 000 × (ideal conditions), providing high resolution imaging in a digital format. The SEM images were acquired at a working pressure of 1.5 x10 −2 Pa, a working distance between 8-22 mm, and an electron acceleration voltage of 10-25 kV [35][36][37].…”