Synthesis of Ce³⁺-doped Y₃Al₅O₁₂ phosphor particles by precipitation method with diamine molecules as precipitating agent

Abstract

An aqueous solution of aluminum nitrate and yttrium nitrate was prepared and ethylenediamine molecules were added into the aqueous solution. The obtained precipitated precursor particles were fired and oxide particles were obtained. When ethylenediamine was used for the precipitation, the single phase of YAG was obtained by firing the precursor particles at more than 1073 K. On the other hand, when hexamethylenediamine was used for the precipitation, the YAG phase was not able to obtained by firing the precursor at 1373 K. Formation behavior of YAG phase greatly depended on the used diamine molecules. Furthermore, Ce 3+ -doped YAG particles were prepared by firing precipitated particles from the aqueous solution in which the nitrates of Al 3+ , Y 3+, and Ce 3+ were dissolved with ethylenediamine as precipitating agent. The PL spectra of the obtained particles had the photoluminescence (PL) peak at 535 nm even though the firing temperature was 1073 K.

Effective Yellow Y3Al5O12:Ce3+ Nanophosphor for Light‐Emitting Diode and Photovoltaic Cell as a Downconverter

“…[ 3 ] As an easy example by the top‐down method, a precise control of chemical reaction rate of precursors in solution can make fine and uniform nanophosphors. The precise control of the kinds and the amounts of some reagents such as surfactants or catalysts has been proven to cause the enhancement in the size distribution and morphology; for instances, precipitation method, [ 4 ] microemulsion method, [ 5 ] and solvothermal method. [ 6,7 ] The generally used general commercial Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) phosphor gives a perfect quantum efficiency (QE) around 95%.…”