Hydrogen Peroxide‐Treated Carbon Dot Phosphor with a Bathochromic‐Shifted, Aggregation‐Enhanced Emission for Light‐Emitting Devices and Visible Light Communication. Issue 8 (13th June 2018) - Zhou, Zhengjie
Abstract: It is demonstrated that treatment of blue‐emissive carbon dots (CDs) with aqueous hydrogen peroxide (H2 O2 ) results in the green emissive solid state CD phosphor with photoluminescence quantum yield of 25% and short luminescence lifetime of 6 ns. The bathochromic‐shifted, enhanced green emission of H2 O2 ‐treated CDs in the powder is ascribed to surface state changes occurring in the aggregated material. Using the green emissive H2 O2 ‐treated CD phosphor, down‐conversion white‐light‐emitting devices with cool, pure, and warm white light are fabricated. Moreover, using the green emissive CD phosphor as a color converter, a laser‐based white‐light source is realized, and visible light communication with a high modulation bandwidth of up to 285 MHz and data transmission rate of ≈435 Mbps is demonstrated. Abstract : Pure carbon dot (CD) phosphor with an intense green emission in the aggregated state (photoluminescence quantum yield up to 25%) is realized by a straightforward surface treatment method of blue‐emissive CDs with aqueous hydrogen peroxide solution. Using the CD phosphor as a color converter, visible light communication with high modulation bandwidth to 285 MHz and a data transmission rate of 435 Mbps is realized.