Red-Emitting Coatings forMultifunctional UV/Red Emitting LEDs Applied in Plant Circadian Rhythm Control

Autor(es)

Bispo-Jr, Airton G. ; Lima, Sergio A. M. ^{[1, 2]} ; Carlos, Luis D. ^{[3, 4]} ; Ferreira, Rute A. S. ^{[3, 4]} ; Pires, Ana M. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Bispo-Jr, Jr., Airton G., Sao Paulo State Univ Unesp, Sch Technol & Sci, BR-19060900 Presidente Prudente, SP - Brazil

^[2] Bispo-Jr, Jr., Airton G., Sao Paulo State Univ Unesp, Inst Biosci Humanities & Exact Sci, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

^[3] Univ Aveiro, Aveiro Inst Mat, CICECO, P-3810193 Aveiro - Portugal

^[4] Univ Aveiro, Aveiro Inst Mat, Dept Phys, P-3810193 Aveiro - Portugal

• Tipo de documento: Artigo Científico
• Fonte: ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY; v. 9, n. 1 SEP 20 2019.
• Citações Web of Science: 1

Resumo

Multifunctional light-emitting diodes (LEDs) formed by coating deep-UV-emitting (<300 nm) LED chips with downshifting phosphors are of great interest for applications in indoor farms as both antibacterial (UV radiation) and photosynthetic agent (red light). Challenges include the fabrication of high-brightness downshifting converter films with controlled thickness excited in the deep-UV spectral region. We address it by optimizing the amount of Ba2SiO4: Eu(III) red-emitting phosphor dispersed in poly (methyl) methacrylate (PMMA), yielding luminescent films with tunable thickness. Taking advantage of the intra-4f(6) transitions, the Eu(III) luminescence is used as local probe, pointing out the presence of 8 non-equivalent local sites for the lanthanides. PMMA enables the processing of flexible films and simultaneously acts as a selective filter to deep-UV radiation, controlling the amount of UV radiation for indoor farm applications. Moreover, after the dispersion in PMMA, the Eu(III)-based luminescence remains analogous to that of the isolated phosphor with an absolute emission quantum yield of 0.11 +/- 0.01, confirming that Ba2SiO4:Eu(III)/PMMA films display desirable features to be used as coatings of deep-UV emitting LEDs toward multifunctional devices for indoor farm application. (C) The Author(s) 2019. Published by ECS. (AU)

• Processo FAPESP: 16/20421-9 - Dispositivos tricromáticos a base de Ba2SiO4:Eu3+ e/ou Tb3+: síntese sol-gel e deposição eletroforética visando aplicação em LEDs brancos
• Beneficiário: Airton Germano Bispo Júnior
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 17/21995-1 - Dispositivos tricromáticos a base de Ba2SiO4:Eu3+ e/ou Tb3+: síntese sol-gel e deposição eletroforética visando aplicação em LEDs brancos
• Beneficiário: Airton Germano Bispo Júnior
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 15/10394-1 - Filmes LBL luminescentes de Ba2SiO4 dopado com terras raras obtido via sol-gel para aplicação em LEDs brancos
• Beneficiário: Airton Germano Bispo Júnior
• Modalidade de apoio: Bolsas no Brasil - Mestrado