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Luminescent Transparent Wood for Diffusive White Light Generation
Francesco Bolognesi1,2, Seyed Ehsan Hadi1, Vivek Richards Pakkam Gabriel1
1Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, Stockholm 10044, Sweden.
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Diffused white light is generated from a single-layer transparent wood (TW) composite incorporating a mixture of green and red CdSe/ZnS quantum dots (QDs) under blue light-emitting diode (LED) excitation. Unlike conventional multilayer or single-emitter systems, a simple codispersion strategy is used in which multiple QDs are incorporated within a single TW layer. Notably, no blue-emitting QDs are required. The QD-TW composites show excellent mechanical properties. The 0.6 mm thick composite shows high optical transmittance, strong haze, and a quantum yield of 42%. Under UV-blue excitation, the composite produces homogeneous white light through the combined contributions of QD emission and TW light scattering. TW can serve as a sustainable, mechanically robust platform for multicolor emitters and provide glare-free, uniform illumination.
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