AI Article Synopsis
- YAlO:Ce phosphors are key for white LEDs due to their luminescent efficiency, necessitating a deep understanding of their synthesis and structure.
- A study using in situ TEM/STEM demonstrates that nanocrystalline CeO fully dissolves in the Y-Al oxide matrix above 900 °C, leading to the formation of YAlO-type particles by 1000 °C and subsequently YAG:Ce particles above 1180 °C.
- EDS mapping shows that cerium atoms replace yttrium in atomic sites, corroborated by photoluminescence tests confirming the phosphor's high luminescent performance.
Article Abstract
YAlO:Ce (YAG:Ce) phosphors are extensively used in the field of white light-emitting diodes (LEDs) due to their efficient luminescent properties. To optimize the performance of YAG:Ce phosphors, a comprehensive understanding of their synthesis and structural evolution is essential. This paper presents a direct in situ transmission electron microscopy (TEM) /scanning TEM (STEM) investigation on the transformation process of a precursor comprising nanocrystalline CeO dispersed in an amorphous Y-Al oxide matrix into crystalline YAG:Ce particles. The study reveals that nanocrystalline CeO particles dissolve completely in the Y-Al oxide matrix at a temperature above 900 °C, while YAlO (YAP)-type crystalline particles with AlO phase in grain boundaries are observed above 1000 °C. Finally, YAG:Ce-type crystalline particles are formed above 1180 °C. Atomic-resolution energy-dispersive X-ray spectroscopy (EDS) elemental mapping demonstrates that the doped cerium (Ce) atoms occupy the same atomic sites as yttrium (Y). Photoluminescence measurements validate the efficient luminescent properties of the obtained YAG:Ce phosphor.
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| http://dx.doi.org/10.1002/smll.202308001 | DOI Listing |
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