Efficient Energy Transfer within Dyes Encapsulated Metal-Organic Frameworks to Achieve High Performance White Light-Emitting Diodes

The development of phosphor-converted white light-emitting diodes (WLEDs) with high quantum yield, high color-rendering index (CRI), and moderate correlated color temperature is highly desirable and remains a challenging task. Herein, a new yellow phosphor is designed and synthesized via the simultaneous encapsulation of three highly luminescent dyes, Cou-6, R6G, and R101 into microporous metal-organic frameworks (MOFs) ZJU-28. Due to the matched spectral overlap and efficient energy transfer processes among these dyes within MOFs, the single-phase phosphor ZJU-28 superset of Cou-6/R6G/R101 (0.016 wt% Cou-6, 0.010 wt% R6G, and 0.014 wt% R101) emits bright and warm white light with high quantum yield of 82.9%, under the excitation of 460 nm blue light. In addition, by integrating the MOF phosphor on commercially available 460 nm blue LED chips, a high performance WLED lamp with a luminous efficiency value of 126 lm W-1, moderate correlated color temperature of 4446 K, and high CRI of 88 is obtained, opening a new perspective for the development of white-light-emitting diodes.