High-performance near-infrared OLEDs maximized at 925 nm and 1022 nm through interfacial energy transfer

High-performance near-infrared OLEDs maximized at 925 nm and 1022 nm through interfacial energy transfer

31 May 2024 | Chieh-Ming Hung, Sheng-Fu Wang, Wei-Chih Chao, Jian-Liang Li, Bo-Han Chen, Chih-Hsuan Lu, Kai-Yen Tu, Shang-Da Yang, Wen-Yi Hung, Yun Chi & Pi-Tai Chou
This study presents a significant advancement in near-infrared (NIR) organic light-emitting diodes (OLEDs) by utilizing interfacial energy transfer between a Pt(II) complex and a NIR fluorescent dye, BTP-eC9. The research demonstrates that by employing a transfer printing technique, a layer of BTP-eC9 can be precisely imprinted onto a thin layer of Pt(II) complex, which is capable of self-assembly. The Pt(II) complex emits deep-red phosphorescence at ~740 nm, while BTP-eC9 emits fluorescence at >900 nm. Through interfacial energy transfer, the phosphorescence from the Pt(II) complex is efficiently transferred to BTP-eC9, resulting in hyperfluorescence at >900 nm. This process leads to the emission of light at 925 nm with an external quantum efficiency (EQE) of 2.24% and a maximum radiance of 39.97 W sr⁻¹ m⁻². The study also shows that this approach is effective for another dye, BTPV-eC9, which emits at 1022 nm, achieving an EQE of 0.66% and a maximum radiance of 18.67 W sr⁻¹ cm⁻². The success of this method is attributed to the self-assembled molecular layers, which facilitate efficient energy transfer and enhance the performance of the OLEDs. The study highlights the importance of interfacial energy transfer in overcoming the energy gap law, which limits the efficiency of NIR OLEDs. The results demonstrate that the sandwiched structure of the OLEDs, with Pt(II) complex as the energy donor and BTP-eC9 as the energy acceptor, achieves a high EQE and radiance, making it a promising approach for the development of high-performance NIR OLEDs. The study also emphasizes the role of molecular assembly and the optimization of the device structure in achieving efficient energy transfer and improved performance. The findings contribute to the advancement of NIR OLEDs, which have potential applications in bioimaging and other fields requiring high-performance NIR light sources.This study presents a significant advancement in near-infrared (NIR) organic light-emitting diodes (OLEDs) by utilizing interfacial energy transfer between a Pt(II) complex and a NIR fluorescent dye, BTP-eC9. The research demonstrates that by employing a transfer printing technique, a layer of BTP-eC9 can be precisely imprinted onto a thin layer of Pt(II) complex, which is capable of self-assembly. The Pt(II) complex emits deep-red phosphorescence at ~740 nm, while BTP-eC9 emits fluorescence at >900 nm. Through interfacial energy transfer, the phosphorescence from the Pt(II) complex is efficiently transferred to BTP-eC9, resulting in hyperfluorescence at >900 nm. This process leads to the emission of light at 925 nm with an external quantum efficiency (EQE) of 2.24% and a maximum radiance of 39.97 W sr⁻¹ m⁻². The study also shows that this approach is effective for another dye, BTPV-eC9, which emits at 1022 nm, achieving an EQE of 0.66% and a maximum radiance of 18.67 W sr⁻¹ cm⁻². The success of this method is attributed to the self-assembled molecular layers, which facilitate efficient energy transfer and enhance the performance of the OLEDs. The study highlights the importance of interfacial energy transfer in overcoming the energy gap law, which limits the efficiency of NIR OLEDs. The results demonstrate that the sandwiched structure of the OLEDs, with Pt(II) complex as the energy donor and BTP-eC9 as the energy acceptor, achieves a high EQE and radiance, making it a promising approach for the development of high-performance NIR OLEDs. The study also emphasizes the role of molecular assembly and the optimization of the device structure in achieving efficient energy transfer and improved performance. The findings contribute to the advancement of NIR OLEDs, which have potential applications in bioimaging and other fields requiring high-performance NIR light sources.
Reach us at info@study.space
[slides] High-performance near-infrared OLEDs maximized at 925%E2%80%89nm and 1022%E2%80%89nm through interfacial energy transfer | StudySpace