Perspectivas em iluminação de estado sólido: o papel da codopagem no desenvolvimento de compostos YAG para LEDs brancos
Perspectives on solid-state lighting: the role of doping in the development of YAG compounds for white LEDs
DOI:
https://doi.org/10.13102/cad.fs.uefs.v24i01.13261Palavras-chave:
Y3Al5O12, terra rara, sol-gel, luminescência, WledResumo
As propriedades estruturais e luminescentes de compostos do tipo granada (garnet), em especial a granada de ítrio e alumínio (YAG – Y3Al5O12), foram investigadas na forma pura, dopada e codopadas com íons terras raras, Eu³⁺ e Tb³⁺. O estudo teve como foco o potencial desses materiais para aplicações em diodos emissores de luz branca (WLEDs – White Light Emitting Diodes), visando aprimorar a eficiência e a qualidade da iluminação de estado sólido. A síntese dos materiais foi realizada através do método sol-gel modificado, que emprega glicose como agente polimerizante, resultando em pós eficientes. A caracterização estrutural por difratometria de raios X (DRX) e refinamento Rietveld confirmou a formação da fase desejada e permitiu a determinação precisa dos parâmetros de rede e do tamanho médio do cristalito, os quais variaram em função das concentrações de dopantes. A espectroscopia de absorção de raios X (XAS) e luminescência óptica excitada por raios X (XEOL) confirmou que o Eu3+ se manteve no estado de oxidação trivalente, sem indícios de redução para Eu2+, atestando a estabilidade da matriz, mesmo sob excitação com radiação ionizante. As medidas de fotoluminescência (PL) revelaram as transições típicas dos íons terras raras presentes e demonstraram que as intensidades de emissão são influenciadas pelas concentrações dos dopantes Eu, Tb. Os espectros de emissão obtidos possibilitaram a determinação dos diagramas de cromaticidade, essenciais para a calibração de cor em dispositivos de iluminação. Além disso, os espectros indicaram uma forte dependência com a concentração dos íons, fornecendo informações valiosas sobre a simetria local em torno dos íons Eu3+, fundamentais para otimizar o desempenho destes materiais. Os resultados comprovam o sucesso da síntese e a adequação destes materiais para aplicações em WLEDs.
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Copyright (c) 2026 Wellisson Santos Silveira, Ariosvaldo Junior Sousa Silva, Ricardo Daniel Soares Santos
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