HOST-FREE HYPERFLUORESCENT OLEDS BASED ON SQUARAINE DYES FOR ORGANIC UPCONVERSION DEVICES

Guilherme Soares Emenes; Dayvid Mello Nascimento; João Pedro Ferreira Assunção; Rafael Dos Santos Carvalho; Marco Cremona; Roland Hany; Elodie Didier

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Trabalho

Título do Trabalho

HOST-FREE HYPERFLUORESCENT OLEDS BASED ON SQUARAINE DYES FOR ORGANIC UPCONVERSION DEVICES

Autores

Guilherme Soares Emenes
Dayvid Mello Nascimento
João Pedro Ferreira Assunção
Rafael Dos Santos Carvalho
Marco Cremona
Roland Hany
Elodie Didier

Modalidade

Pôster - resumo

Área temática

Dispositivos optoeletrônicos

Data de Publicação

27/05/2026

País da Publicação

Brasil

Idioma da Publicação

pt-BR

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2026/1462706-host-free-hyperfluorescent-oleds-based-on-squaraine-dyes-for-organic-upconversion-devices

ISBN

978-65-272-2467-9

Palavras-Chave

Organic electronics, TADF OLEDs, Hyperfluorescent OLEDs

Resumo

Efficient detection and imaging in the near-infrared (NIR) spectral region are critical for applications ranging from information and communication technologies to robotics and machine vision systems. While current NIR imaging technologies rely predominantly on inorganic semiconductors, all-organic upconversion devices (OUCs) have recently emerged as promising alternatives for next-generation NIR light detection. OUCs consist of a monolithic integration of an organic NIR photodetector and an organic light-emitting diode (OLED), enabling wavelength upconversion within a fully organic platform [1,2]. In this work, we report host-free hyperfluorescent (HF) OLEDs designed for integration into OUC architectures. The devices employ CzDBA (5,10-Bis(4-(9H-carbazol-9-yl)-2,6-dimethylphenyl)-5,10-dihydroboranthrene) as a thermally activated delayed fluorescent (TADF) sensitizer and, for the first time, a fully evaporated indole squaraine (ISQ) dye (1,3-Bis[(3,3-dimethylindolin-2-ylidene) methyl] squaraine) as the final fluorescent emitter [3]. Squaraine dyes are particularly attractive due to their narrowband red and NIR emission, high photophysical stability, and suitability for optoelectronic applications. The emitting layers were fabricated via thermal co-evaporation of CzDBA and ISQ at varying ISQ concentrations (0–10 wt% relative to CzDBA). The OLEDs’ final structure were MoO3(Molybdenum(VI) Oxide)/ C60(Fullerene-C)/CzDBA:ISQ/TPBi(1,3,5-Tris(1-phenyl-1Hbenzimidazol-2-yl)benzene)/ Al (aluminium). CzDBA-only OLEDs exhibited high luminance values of up to 140,000 cd·m?² with emission centered at 560 nm. Upon incorporation of ISQ, an efficient and complete energy transfer from the TADF sensitizer to the squaraine emitter was achieved, resulting in a pronounced spectral shift toward 670 nm with significantly narrowed emission bandwidth. These results confirm the successful realization of a two-component, host-free HF-OLED architecture and highlight the potential of squaraine-based hyperfluorescent systems for high-performance organic upconversion and NIR optoelectronic devices. We acknowledge to financial support from FAPESP (Grant No. 2025/27044-5), CNPq (Grant No. 408449/2024-1), Swiss National Science Foundation (Grant No. CRSII5_216629/1) and INEO. [1] W.-H. Hu, J. P. F. Assunção, R. dos S. Carvalho, E. Didier, M. Diethelm, S. Jenatsch, D. Bachmann, I. Shorubalko, M. Cremona, F. Nüesch, M. Bauer, R. Hany, Photomultiplication Enabling Efficient Shortwave Infrared-Sensitive Organic Upconversion Devices. Adv. Funct. Mater. 2024, 34, 2407528. https://doi.org/10.1002/adfm.202407528 [2] W.-H. Hu, C. Vael, M. Diethelm, K. Strassel, S. B. Anantharaman, A. Aribia, M. Cremona, S. Jenatsch, F. Nüesch, R. Hany, On the Response Speed of Narrowband Organic Optical Upconversion Devices. Adv. Optical Mater. 2022, 10, 2200695. https://doi.org/10.1002/adom.202200695 [3] Kotadiya, N.B., Blom, P.W.M. & Wetzelaer, GJ.A.H. Efficient and stable single-layer organic light-emitting diodes based on thermally activated delayed fluorescence. Nat. Photonics 13, 765–769 (2019). https://doi.org/10.1038/s41566-019-0488-1

Título do Evento: Workshop do INEO 2026
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop do INEO 2026
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

EMENES, Guilherme Soares et al.. HOST-FREE HYPERFLUORESCENT OLEDS BASED ON SQUARAINE DYES FOR ORGANIC UPCONVERSION DEVICES.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1462706-HOST-FREE-HYPERFLUORESCENT-OLEDS-BASED-ON-SQUARAINE-DYES-FOR-ORGANIC-UPCONVERSION-DEVICES. Acesso em: 10/08/2026