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Journal of the Korean Ceramic Society 1996;33(8): 942. |
| PbO-$Bi_2O_3-Ga_2O_3$ 유리내 $Nd_{3+}$와 $OH_-$ 사이의 에너지 전달 현상 |
| 최용규, 허종 |
| 포항공과대학교 재료·금속공학과 비정질부기재료연구실 |
| Energy Transfer Phenomena between $Nd_{3+}$ and $OH_-$ in PbO-$Bi_2O_3-Ga_2O_3$ |
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| ABSTRACT |
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Heavy Metal Oxide Glasses (HMOG) have been considered as one of the potential hosts for fiber -optic amplifiers and mid-IR lasers due to the low vibration al phonon energy. Effects of the spurious OH_ on the emission characteristics of Nd3+ -doped PbO-Bi2O3-Ga2O3 glasses were investigated. Analyses of the decay be-havior of 1.34${mu}{textrm}{m}$ fluorescence from the 4Fe3/2longrightarrow4I13/2 transition in Nd3+ suggested two different energy trans-fer mechanisms between Nd3+ and OH-. For a glass doped with low concentration (0.05wt%) of Nd2O3 the intensity of the emission followed by a non-exponential decaying behavior following the relationship of exp(t0.5) where t stands for a time scale. On the other hand an exponential behavior was dominant for the glasses containing more than 0.5wt% of Nd2O3. A direct energy transfer from Nd3+, OH- seemed to be responsible for the non-exponential decaying behavior and its rate constant was proportional to R-6 where R is the distance between Nd3+ and OH_ The critical transfer distance (Ro) was calculatedto be 0.464 nm Non-radiative decay in the glasses with high concentration (>0.5wt%) of Nd2O3 is mainly originated from the cross relaxation of 4Fe3/2longrightarrow4I13/2 : 4I15/2longrightarrow4I15/2 among the neighboring Nd3+ |
| Key words:
PbO-$Bi_2O_3-Ga_2O_3$ glasses, $Nd_{3+}$tex>$OH_-$ : Energy transfer, Croo relaxation |
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