應用於近紅外光寬譜帶光纖放大器之四價鉻離子摻雜石榴石螢光材料

Abstract

近年來，近紅外光二區螢光粉已廣泛應用於製作螢光粉轉化發光二極體(phosphor-converted light-emitting diodes; pc-LEDs)並於眾多領域展現其應用價值。然因其於光通訊領域之應用尚未被充分研究與探討，故本研究旨於將近紅外光二區螢光粉製作為晶體光纖，並以提升光轉換效率為目標，將其應用於光通訊領域。 本研究第一部分著重於合成近紅外光二區之Y3−yAl4.9O12:0.1Cr3+/4+,yCa2+螢光粉。藉Cr與Ca2+摻雜入主體結構Y3Al5O12 (YAG)，Cr作為活化劑，Ca2+作為促使價數補償導致Cr3+轉為Cr4+之關鍵元素，得近紅外光二區1100–1600 nm之寬譜放射。將最佳條件之螢光粉生長為晶體光纖，結果展現其近紅外光二區放光強度高於商用YAG:Cr4+晶體光纖。 本研究第二部分則著重於合成Y3−y−zAl4.9O12:0.1Cr3+/4+,yCa2+,zMg2+螢光粉。藉Cr、Ca2+及Mg2+摻雜於主體結構YAG中，提升近紅外光二區放光強度。Cr作為活化劑，Ca2+作為促使價數補償誘導Cr3+轉為Cr4+之關鍵元素，Mg2+作為促使部分價數補償與提升晶體結構之重要摻雜元素，得較第一部分研究更強之近紅外光二區1100–1600 nm區段之寬譜放射。將該系列之最佳螢光粉生長為晶體光纖，其近紅外光二區放光之表現更優異，其放光強度更高於第一部分研究之晶體光纖。 本研究之新穎性為成功將近紅外光二區螢光粉應用於光通訊領域，此方法於第一部分得近紅外光二區晶體光纖實現，於第二部分持續提升放光效率。此外，本研究藉結構、放光性質及晶體光纖測量進行分析，最終將生長之晶體光纖與商用品進行比較，證實其於應用層面之潛力。

In recent years, near-infrared-II (NIR-II) phosphors have been widely utilized as phosphor-converted light-emitting diodes (pc-LEDs) for various applications. However, their application in optical communications remains unexplored. Thus, this study aims to develop NIR-II phosphor into crystal fibers for optical communications applications and enhance their performance. The first part of the study focuses on synthesizing Y3−yAl4.9O12:0.1Cr3+/4+,yCa2+ phosphors. Cr3+/4+ and Ca2+ are doped into Y3Al5O12 (YAG), with Cr as activators and Ca2+ as charge compensators to convert Cr3+ to Cr4+ to achieve NIR-II broadband emission of 1100–1600 nm. The optimized phosphor is grown into crystal fibers, showing significantly higher NIR-II emission than commercial YAG:Cr4+ crystal fibers. The second part of the study focuses on synthesizing Y3−y−zAl4.9O12:0.1Cr3+/4+,yCa2+,zMg2+ phosphors to enhance NIR-II emission. Cr3+/4+, Ca2+, and Mg2+ are doped into YAG, with Cr as activators, Ca2+ as charge compensators, Mg2+ as dopants to improve the crystal structure, exhibiting stronger NIR-II broadband emission of 1100–1600 nm. The optimized phosphor is grown into crystal fiber, showing higher NIR-II emission than the grown crystal fiber in the first part. The novelty of this study lies in the successful application of NIR-II phosphors in optical communications. The NIR-II crystal fibers are achieved in the first part, and the NIR-II emission is enhanced in the second part. Through structural analysis, luminescence characterization, and measurement of crystal fibers, the study demonstrates the potential of the materials for practical applications.