The demonstration of reliable and stable white light-emitting diodes (LEDs) is one of the main technological challenges of the LED industry. This is usually accomplished by incorporation of light-emitting rare-earth elements (REEs) compounds within an external polymeric coating of a blue LED allowing the generation of white light. However, due to both environmental and cost issues, the development of low-cost REE-free coatings, which exhibit competitive performance compared to conventional white LED is of great importance. In this work, the formation of an REE-free white LED coating is demonstrated. This biocomposite material, composed of biological (crystalline nanocellulose and porcine gastric mucin) and organic (light-emitting dyes) compounds, exhibits excellent optical and mechanical properties as well as resistance to heat, humidity, and UV radiation. The coating is further used to demonstrate a working white LED by incorporating it within a commercial blue LED.
Bibliographical noteFunding Information:
J.G. and T.B.S. contributed equally to this work. S.R. acknowledges the Kamin fund 56301 for the financial support. A.C-R. was supported by the National Health & Medical Research Council (NHMRC) of Australia (GNT1112432). The authors thank the support of the Monash Centre for Electron Microscopy (MCEM), Monash University, where the transmission electron microscopy analysis was performed. This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). The authors would like to thank Dr. John Zhu (MCN) for performing of the confocal microscopy measurements.
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- crystalline nanocellulose
- phosphor materials
- white LEDs