tailieunhanh - Báo cáo hóa học: " Light-emitting diodes enhanced by localized surface plasmon resonance"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Light-emitting diodes enhanced by localized surface plasmon resonance | Gu et al. Nanoscale Research Letters 2011 6 199 http content 6 1 199 o Nanoscale Research Letters a SpringerOpen Journal NANO REVIEW Open Access Light-emitting diodes enhanced by localized surface plasmon resonance Xuefeng Gu1 2 Teng Qiu1 Wenjun Zhang3 Paul K Chu3 Abstract Light-emitting diodes LEDs are of particular interest recently as their performance is approaching fluorescent incandescent tubes. Moreover their energy-saving property is attracting many researchers because of the huge energy crisis we are facing. Among all methods intending to enhance the efficiency and intensity of a conventional LED localized surface plasmon resonance is a promising way. The mechanism is based on the energy coupling effect between the emitted photons from the semiconductor and metallic nanoparticles fabricated by nanotechnology. In this review we describe the mechanism of this coupling effect and summarize the common fabrication techniques. The prospect including the potential to replace fluorescent incandescent lighting devices as well as applications to flat panel displays and optoelectronics and future challenges with regard to the design of metallic nanostructures and fabrication techniques are discussed. Introduction Light-emitting diodes LEDs have attracted much scientific and commercial interest since the realization of a practical LED device with emission frequencies in the visible region of the electromagnetic spectrum 1 . Since then research activities have been focusing on how to produce economical LEDs with the desired colors as well as white light sources 2 . The strong demand has also driven materials technology and new emitting materials and configurations have been proposed to enhance the performance. For example the use of a polymer instead of small molecules opens the door to flexible large-area and stable organic LEDs OLEDs 3 . In the past 15 years low-dimensional emitting devices incorporating quantum dots QDs and quantum wells QWs