Multi-luminescent center integrated metal–organic frameworks for high-performance white light-emitting diodes

Abstract

The development of multi-luminescent center-integrated phosphors with high-quality and tunable white light emission is highly desirable for practical applications in solid-state lighting, but it remains challenging. Herein, a novel strategy of integrating dyes and perovskite nanocrystals into different locations of metal–organic frameworks (MOFs) to achieve high-performance white lighting-emitting diodes (WLEDs) is proposed. Based on the emerging dye-encapsulated MOF system, CsPbX₃ nanocrystals (NCs) with a high PLQY and tunable bandgap were utilized as additional emission centers, contributing to spectral complementarity and energy transfer. The spatial separation of dyes and CsPbX₃ NCs results in no mutual interference between each other during loading, enabling more flexible emission tuning. The resulting LED based on the combination of ZIF-8⊃pm567A/SRh101@CsPbClBr₂–SiO₂ and a 460 nm blue LED chip exhibits exceptional Commission Internationale de l’Eclairage (CIE) coordinates of (0.329, 0.334), a moderate correlated color temperature (CCT) of 5681 K and a high color-rendering index (CRI) of 88. In addition, cold and warm WLEDs were also realized by only fine-tuning the loading amounts of CsPbClBr₂ NCs, without sacrificing the high CRI. This strategy offers a new perspective for the design of white light-emitting phosphors with excellent color quality and facilitates the advancement of high-performance WLEDs.