Crystal?Field Splitting of Ce3+ 5d Levels in Yttrium Aluminum Garnet Academic Article uri icon

abstract

  • Cerium-doped yttrium aluminum garnet (Ce: YAG) is a commercially produced cathodoluminescent source with good resolution and a fast time constant [l]. Recently Tomiki et al.[2] have spectrally analyzed as-grown cerium-doped YAG and identified five 4f--f 5d absorption transitions in the crystal (at approximately 460, 340, 270, 220, and 200nm). This result was quite new, as only three 5d lines (at 460,340, and 220 nm) had been identified previously [3, 41. Indeed, on first observation, a different explanation of the band between 250 and 300 nm is possible. It has been established [5 to 81 that Fe3+ has a strong charge transfer band in that spectral region. Trace contamination of Fe3+ into YAG crystals is very common [5 to 81; if such Fe3+ ions were introduced with Ce3+ doping, and were capable of transferring energy to Ce3+ ions (they are known to transfer to Nd3+ ions in neodymium …

publication date

  • January 1, 1992