Amine-Free Synthesis of Cesium Lead Halide Perovskite Quantum Dots for Efficient Light-Emitting Diodes

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Yassitepe, Emre ; Yang, Zhenyu ; Voznyy, Oleksandr ; Kim, Younghoon ; Walters, Grant ; Castaneda, Juan Andres ; Kanjanaboos, Pongsakorn ; Yuan, Mingjian ; Gong, Xiwen ; Fan, Fengjia ; Pan, Jun ; Hoogland, Sjoerd ; Comin, Riccardo ; Bakr, Osman M. ; Padilha, Lazaro A. ; Nogueira, Ana F. ; Sargent, Edward H.

• Tipo de documento: Artigo Científico
• Fonte: ADVANCED FUNCTIONAL MATERIALS; v. 26, n. 47, p. 8757-8763, DEC 20 2016.
• Citações Web of Science: 94

Resumo

Cesium lead halide perovskite quantum dots (PQDs) have attracted significant interest for optoelectronic applications in view of their high brightness and narrow emission linewidth at visible wavelengths. A remaining challenge is the degradation of PQDs during purification from the synthesis solution. This is attributed to proton transfer between oleic acid and oleylamine surface capping agents that leads to facile ligand loss. Here, a new synthetic method is reported that enhances the colloidal stability of PQDs by capping them solely using oleic acid (OA). Quaternary alkylammonium halides are used as precursors, eliminating the need for oleylamine. This strategy enhances the colloidal stability of OA capped PQDs during purification, allowing us to remove excess organic content in thin films. Inverted red, green, and blue PQD light-emitting diodes (LED) are fabricated for the first time with solution-processed polymer-based hole transport layers due to higher robustness of OA capped PQDs to solution processing. The blue and green LEDs exhibit threefold and tenfold improved external quantum efficiency (EQE), respectively, compared to prior related reports for amine/ammonium capped cross-linked PQDs. The brightest blue LED based on all inorganic CsPb(Br1-xClx)(3) PQDs is also reported. (AU)

• Processo FAPESP: 14/18327-9 - Quantum dots coloidais com defeitos superficiais passivados para aplicações em células solares de filmes finos de heterojunção P-N
• Beneficiário: Emre Yassitepe
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 13/16911-2 - Espectroscopia avançada em novos nanomateriais
• Beneficiário: Lázaro Aurélio Padilha Junior
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 13/05798-0 - Investigacao de Nanoparticulas Coloidais de Calcopirita Tipo (Ag,Cu)(In,Ga)(S,Se)2 Passivadas para Aplicacoes em Celulas Solares de Filmes Finos
• Beneficiário: Emre Yassitepe
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado