Abstract
Recently, significant advances have occurred in the development of phosphors for bio hybrid light-emitting diodes (Bio-HLEDs), which have created brighter, metal-free, rare-earth phosphor-free, eco-friendly, and cost-competitive features for visible light emission. Here, we demonstrate an original approach using bioinspired phosphors in Bio-HLEDs based on natural deoxyribonucleic acid (DNA)-curcumin complexes with cetyltrimethylammonium (CTMA) in bio-crystalline form. The curcumin chromophore was bound to the DNA double helix structure as observed using field emission tunnelling electron microscopy (FE-TEM). Efficient luminescence occurred due to tightly bound curcumin chromophore to DNA duplex. Bio-HLED shows low luminous drop rate of 0.0551 s−1. Moreover, the solid bio-crystals confined the activating bright luminescence with a quantum yield of 62%, thereby overcoming aggregation-induced quenching effect. The results of this study herald the development of commercially viable large-scale hybrid light applications that are environmentally benign.
Highlights
The use of rare-earth phosphors in blue light-emitting diode (BLED) technology has several disadvantages[1,2], such as the (i) metallic or inorganic (ii) cost-intensive and (iii) toxic nature of these compounds
Curcumin chromophore binding to deoxyribonucleic acid (DNA) duplex
Verifying the binding of curcumin chromophore to the DNA structure was extremely critical to confirming our data
Summary
The use of rare-earth phosphors in blue light-emitting diode (BLED) technology has several disadvantages[1,2], such as the (i) metallic or inorganic (ii) cost-intensive and (iii) toxic nature of these compounds. These limitations should be overcome to produce BLED-based rare-earth phosphor free LEDs (RPF-LEDs). Fluorescent proteins have been applied to develop a new device concept called bio hybrid light-emitting diode (Bio-HLED)[8]. Another alternative in this emerging field is the bioinspired phosphors achieved by the use of DNA as bio-scaffold. Because of these numerous advantages, we propose a new approach to obtaining brighter and cost-competitive visible light emitters using curcumin as a DNA chromophore
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