WO_3-Based Electrochromic Distributed Bragg Reflector: Toward Electrically Tunable Microcavity Luminescent Device

摘要

The electroresponsive WO3-based electrochromic distributed Bragg reflectorsrn(ECDBRs) are fabricated by means of one-step, room temperature glancinganglernelectron-beam evaporation. The reflectance and Bragg wavelength ofrnECDBRs can be precisely and reversibly tailored on a large scale by simplyrnapplying a small bias voltage (±1.1 V) due to the electrochromic effect of thernWO3 layer, and this unique character is utilized to construct an electricallyrntunable microcavity luminescent device with embedded green CdSe@ZnSrnquantum dots (QDs). Therefore, large and reversible modulation in terms ofrnphotoluminescence (PL) peak intensity (18–335%), PL peak position (fromrn510.3 to 525.8 nm), and full width at half maximum (from 21.8 to 11.4 nm)rnfrom QDs in microcavity are achieved under electrical stimulus. The resultsrnwill potentially provide a straightforward voltage-control route toward broadbandrntunable microcavity electroluminescent and lasing devices.