Emission Characteristics and Energy Transfer Mechanism in Ge-ga-S Glasses co-doped with <tex>$Tm^{3+}$</tex> and <tex>$Ho^{3+}$</tex>

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J. Korean Ceram. Soc. > Volume 33(4); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(4): 425.

$Tm^{3+}$과 $Ho^{3+}$ 이 복합 첨가된 Ge-Ga-S계 유리의 형광 발진 특성 및 에너지 전달기구

조우영, 허종

포항공과대학교 재료·금속공학과 비정질무기재료연구실

Emission Characteristics and Energy Transfer Mechanism in Ge-ga-S Glasses co-doped with $Tm^{3+}$ and $Ho^{3+}$

ABSTRACT

Ge25Ga5S70 glasses doped with Tm3+ or Tm3+/Ho3+ were prepared and the emission efficiencies of 2.02 ${mu}{textrm}{m}$ fluorescence were investigated. In the case of Tm3+ single doping intensity of 1.80${mu}{textrm}{m}$ (3F4longrightarrow8H4) fluorecence remained unchange. Glasses co-doped with Tm3 and H3+ showed a continuous increase in 2.02${mu}{textrm}{m}$ emission intensity with the addition of Tm3 from 0.1 to 1.0 wt% while the amount Tm3:5H4longrightarrowHo3+: 5I7 Claculation of the energy transfer rates based on the steady-state rate equations showed that the forward transfer of Tm3longrightarrowHo3+ increased greater than backward transfer with the addition of Ho3+

Key words: Chalcogenide glass, $Tm^{3+}$, $Ho^{3+}$, Co-doping, Fluorescence, Cross relaxation, Energy transfer