Mass Synthesis of Blue-luminescent SiC Nanoparticles : Application to Flat-panel White Light-emitting Diodes

虽然硅相关半导体纳米晶体（NCs）的光学性能不如硒化镉等化合物半导体材料优异，但由于其无毒性和丰度等优点，成为未来光电器件发展的前沿领域之一。我们提出在飞行等离子体合成具有尺寸可调光致发光的碳化硅纳米管。将制备的NC分散到有机溶剂中，然后进行自旋涂覆制备含薄膜的NC。我们成功制备了3 ~ 12 nm的纳米碳纳米管，并在650 ~ 900 nm范围内观察到与尺寸相关的光致发光。然而，由于nc的显著氧化，电致发光是不可能的。与SiH_4合成的NCs相比，氯端NCs的氧化速度比氢端NCs快1000倍。对于含有照明装置的nc，必须严格消除环境中的氧气和水分，从而进一步发展给定的等离子体技术。

Although optical properties of silicon-related semiconductor nanocrystals (NCs) is not as excellent as compound semiconductor materials such as cadmium selenide, these materials are highlighted as one of the promising frontiers in the future optoelectronic devices because of non-toxicity and abundance. We propose in-flight plasma synthesis of silicon carbide NCs with size tunable photoluminescence. As-produced NCs were dispersed into organic solvent, followed by spin coating to fabricate NC containing thin film. We successfully fabricated 3-12 nm NCs, and observed size-dependent photoluminescence between 650 nm and 900 nm. However electroluminescence was not possible due to significant oxidation of NCs. Compared with NCs synthesized using SiH_4, chlorine- terminated NCs are oxidized 1000-time faster than hydrogen-terminated NCs. Further development of given plasma technology for NCs containing lighting devices, ambient oxygen and moisture must be strictly eliminated.