鐿離子的添加對鉺摻雜氧化鈦與氧化矽的結構與螢光性質之影響

Abstract

由於鉺摻雜材料~1.54μm的螢光正好落於矽光纖的最低能量損失波帶附近•故鉺離子非常適用於當做矽光纖放大器的摻雜物。加入鐿離子當作增感劑可提高980nm光波對系統的起能(pumping)效率，激發態的鐿離子會藉由能量轉移(energy transfer)將能量傳給鉺離子以提高佔據4I13/2能階的電子數目。因此提高1.54μm的螢光強度。故本實驗將就不同母材(host materials)、共摻雜物的添加、起始物的組成比例與熱處理溫度條件來研究其對鉺螢光發光的作用，並探討影響鉺螢光發光的機制。實驗結果顯示，在Er-Yb-Ti系統中成相後對稱性提高造成螢光強度下降的效應比較強。這是由於Er-Yb-Ti系統中成相後鉺離子為8配位對稱性較高，而在Er-Yb-Si成相後鉺離子為6配位對稱性較低。

Erbium doped materials are of great interest in thin film integrated optoelectronic technology because 1.54μm from Er3+ intra-4f emission is a standard telecommunication wavelength. In this research, the addition of Yb3+ ions as sensitizer can lead to the enhancement of ~1.54μm PL efficiency. This is due to that erbium ions can absorb the 980 nm light more efficiently then transfer the energy to other Er3+ ions so as to increase the population of 4I13/2 level. In Yb3+-Er3+co-doped sillica/titania systems, phase evolution and photoluminescence properties would be investigated in different doping levels and temperatures. Results show that symmetry effect in Yb3+-Er3+ co-doped titania system is stronger than that in the Yb3+-Er3+ co-doped silica system. The difference is attributed to the different coordination conditions of Er3+ in two systems. After pyrochlore phase is formed, Er3+ is 8-fold coordinated in titania system while Er3+ is 6-fold coordinated in titania system.The PL intensity properties result from the competition effects of OH- content and structural symmetry. The maximum PL intensity in Yb3+-Er3+ co-doped titania system appears at lower temperature of 700℃, compared to Yb3+-Er3+ co-doped silica system.