White‐Light Emission from Dual‐Way Photon Energy Conversion in a Dye‐Encapsulated Metal–Organic Framework

• Published in: Angewandte Chemie International Edition Vol. 58; no. 29; pp. 9752 - 9757
• Main Authors: Wang, Zheng, Zhu, Cheng‐Yi, Mo, Jun‐Ting, Fu, Peng‐Yan, Zhao, Yan‐Wu, Yin, Shao‐Yun, Jiang, Ji‐Jun, Pan, Mei, Su, Cheng‐Yong
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 15-07-2019
• Edition: International ed. in English
• Subjects: Absorption; Dyes; Encapsulation; Energy conversion; Excitation; host–guest systems; Light; Light emission; Light modulation; Metal-organic frameworks; Phosphors; Photon absorption; photon conversion; Photons; Photovoltaic cells; White light; white light emission; dye; White light; host-guest; TPA; metal-organic framework
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201905186

The design of white‐light phosphors is attractive in solid‐state lighting (SSL) and related fields. A new strategy in obtaining white light emission (WLE) from dual‐way photon energy conversion in a series of dye@MOF (LIFM‐WZ‐6) systems is presented. Besides the traditional UV‐excited one‐photon absorption (OPA) pathway, white‐light modulation can also be gained from the combination of NIR‐excited green and red emissions of MOF backbone and encapsulated dyes via two‐photon absorption (TPA) pathway. As a result, down‐conversion OPA white light was obtained for RhB+@LIFM‐WZ‐6 (0.1 wt %), BR‐2+@LIFM‐WZ‐6 (2 wt %), and APFG+@LIFM‐WZ‐6 (0.1 wt %) samples under 365 nm excitation. RhB+@LIFM‐WZ‐6 (0.05 wt %), BR‐2+@LIFM‐WZ‐6 (1 wt %) and APFG+@LIFM‐WZ‐6 (0.05 wt %) exhibit up‐conversion TPA white light under the excitation of 800, 790, and 730 nm, respectively. This new WLE generation strategy combines different photon energy conversion mechanisms together.
White‐light emission (WLE) was obtained in dye@MOFs. Besides the traditional UV‐excited one‐photon absorption (OPA) pathway, modulation can also be gained from the combination of NIR‐excited green and red emissions of the MOF backbone and encapsulated dyes via a two‐photon absorption (TPA) pathway.