本研究發現由濕化學方法所成長的氧化鋅奈米粒子具有一些特別的光激發螢光性質。反應時間的拉長可以抑制已二醇相中氧化鋅奈米粒子的可見光發光，同時增強近能帶邊緣輻射。 亞麻仁油酸表面改質的氧化鋅奈米粒子，再旋轉塗佈至矽晶片上，做硬化處理前後的螢光譜型幾乎一樣。跟在乙二醇分散液中的液態樣品相比，藍紫外光部分有稍微的藍位移。 將氧化鋅奈米粒子包覆二氧化矽後，取出的固態粉體可以抑制藍紫外光的發光，使樣品只做可見光波段的發光。此樣品經700℃的燒結後，還可提升可見光波段發光強度約2倍。如果此材料可在環氧樹脂固化過程中與其均勻混合，則有應用在白光發光二極體的潛力。 The photoluminescence property of the ZnO NPs produced by wet chemical process was studied in this research. With the increase of reaction time, the visible luminescence was suppressed and the near- band-edge emission was enhanced. Therefore, if visible luminescence was the target, the reaction time should be kept short. The above produce ZnO NPs was further modified with linoleic acid as ligand and coated on silicon wafer. The photoluminescence spectra of coated film before and after thermal cure were identical. A photouminescent hybrid hard coat could thus be obtained. When ZnO NPs were capped with silicon dioxide, the blue-UV emission shrunk, so that only visible luminescence was left. This was true whether the NPs were produced by short or long reaction time. However, short reaction time produced brighter visible luminescence. The luminescence intensity could be further enhanced by almost 2 times after sintering at 700oC for one hour. This material has potential in the application on white LED if it can completely mixed with epoxy resin during curing process.
