Based on the composite consisting of ZnO nanorods (NRs) grown on InGaN/GaN multiple quantum wells (MQWs), we have demonstrated a novel light-emitting device (LED) that has the capability to emit dual beam radiations. Interestingly, the relative intensity between the dual emissions is able to be manipulated by their polarizations. The underlying mechanism can be well understood in terms of the anisotropic optical properties arising from the geometric structures of constituent nanoscale materials. The results shown here may be extended to many other nanocomposite systems and pave a new pathway to create LEDs with tunable properties.
Based on the high surface-to-volume ratio of nanorods and high sensitivity of piezoelectric properties of nitride semiconductors, an enzyme-functionalized composite consisting of nanorods and nitride light-emitting devices (LEDs) provides an excellent opportunity for the development of glucose detectors using optical methods. To demonstrate our working principle, a sensing device based on In0.25Ga0.75N/GaN multiple quantum wells and ZnO nanorods has been constructed and exposed to target glucose solutions. The pronounced changes in both emission and Raman scattering spectra under different target glucose concentrations clearly illustrate the feasibility of our newly designed composite for the creation of highly sensitive biosensors with optical detection.
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