Electron Beam-Assisted Synthesis of YAG:Ce Ceramics

Abstract

In this work, we present the results of the structure and luminescence properties of YAG:Ce (Y3Al5O12 doped with Ce3+ ions) ceramic samples. Their synthesis was carried out by sintering samples from the initial oxide powders under the powerful action of a high-energy electron beam with an energy of 1.4 MeV and a power density of 22–25 kW/cm2. The measured diffraction patterns of the synthesized ceramics are in good agreement with the standard for YAG. Luminescence characteristics at stationary/time-resolved regimes were studied. It is shown that under the influence of a high-power electron beam on a mixture of powders, it is possible to synthesize YAG:Ce luminescent ceramics with characteristics close to the well-known YAG:Ce phosphor ceramics obtained by traditional methods of solid-state synthesis. Thus, it has been demonstrated that the technology of radiation synthesis of luminescent ceramics is very promising.

Spinel-Based ZnAl2O4: 0.5%Cr3+ Red Phosphor Ceramics for WLED

“…In 1995, Shuji Nakamura of Nichia Chemical Industries invented the phosphorconverted white LED system, which first introduced yellow emitting yttrium aluminum garnet (YAG: Ce 3+ ) phosphor coated on a blue LED to the market [6][7][8]. However, the white light obtained using this method lacks red components, limiting its application in high-end indoor lighting [9,10].…”

Color Tunable Composite Phosphor Ceramics Based on SrAlSiN3:Eu2+/Lu3Al5O12:Ce3+ for High-Power and High-Color-Rendering-Index White LEDs/LDs Lighting

“…Specifically, the blue LED chip excites YAG:Ce 3+ yellow phosphor, and the yellowgreen light emitted by the chip mixes with the blue light of the chip itself to produce white light, which is called phosphor-converted (PC) wLED [5][6][7][8]. For PC wLEDs, the Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) phosphor powders are usually encapsulated in silicone gel however, due to the low thermal conductivity and the unsatisfying thermal stability of the silicone gel, this type of PC wLED are not suitable for HP/HB lighting [9][10][11][12].…”

ENHANCING PHOTOMETRIC PERFORMANCE OF YAG:CeCERAMICS: INVESTIGATING THE ROLE OF ANNEALING IN RADIATION-ASSISTED SYNTHESIS

“…Phosphor materials play a crucial role in various modern technologies, particularly in the fields of lighting and display systems. These materials possess the unique ability to convert energy from one form into another, most commonly transforming ultraviolet (UV) or high-energy visible light into lower-energy visible light [1][2][3][4] Among the numerous phosphor materials available, Ce 3+ -doped luminescent phosphors have emerged as a promising candidate for a range of applications [5][6][7][8][9][10]. In particular, cerium-doped yttrium aluminum garnet (YAG:Ce) phosphor ceramics are innovative materials that evolve from the base compound of YAG, doped with cerium (Ce) ions.…”

“…Such versatility and customizability empower these phosphor ceramics to function in a wide range of sectors. From lighting technologies to imaging devices, from signal amplification in telecommunications to their application in medical imaging, the YAG:Ce phosphor ceramics, with their unique properties, can be fine-tuned to meet diverse requirements, reinforcing their appeal and utility in numerous technological innovations [10]. YAG:Ce based phosphor ceramics demonstrate promising potential for applications in light-emitting diodes (LEDs) [11][12][13] and scintillators [14][15][16].…”