High-efficiency all fluorescence white OLEDs with high color rendering index by manipulating excitons in co-host recombination layers

Zhang, Yuanbo; Li, Yanan; Zhang, Chunfang; Liu, Jiabo; Li, Jiarui; Bian, Huisheng; Zhu, Lianqing; Ou, Jian Zhen; Cui, Lin‐Song; Yuan, Long

doi:10.1039/d3nr02568c

Nanoscale

2023

DOI: 10.1039/d3nr02568c

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High-efficiency all fluorescence white OLEDs with high color rendering index by manipulating excitons in co-host recombination layers

Yuanbo Zhang¹,

Yanan Li²,

Chunfang Zhang³

et al.

Abstract: All fluorescence white organic light-emitting diodes (WOLEDs) based on thermally activated delayed fluorescence (TADF) emitters are an attractive route to realize highly efficient and high color quality white light sources....

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2024

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Stable All‐Fluorescence White Organic Light‐Emitting Diodes with High Efficiency and High CRI

Xie,

Hu,

Qin

et al. 2024

Advanced Optical Materials

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White organic light‐emitting diodes (WOLEDs) have been regarded as the candidates for next‐generation flat‐panel displays and solid‐state lighting due to their low cost. However, it is still challenging to achieve two‐component WOLEDs with high efficiency, high color index (CRI), and long lifetime. Here, high‐performance all‐fluorescence WOLEDs based on a blue fluorescent emitter and an orange thermally activated delayed fluorescent (TADF) emitter are demonstrated. The optimized all‐fluorescence WOLED with two EMLs presents the maximum external quantum efficiency (EQE), current efficiency (CE), and power efficiency (PE) of 23.4%, 40.2 cd A−1, and 33.2 lm W−1, corresponding to a maximum CRI value of 83.1 and Commission Internationale de L'Eclairage (CIE) coordinate of (0.30, 0.31). To further improve the device stability, the all‐fluorescence WOLEDs with three EMLs and tandem structure are constructed, respectively. Under the premise of ensuring efficiency, in going from the two‐EMLs to the three‐EMLs and the tandem structure, the LT50 (time to 50% of the initial luminance) of all‐fluorescence WOLEDs increase from 601 to 714 h and 1622 h at an initial luminance of 1000 cd m−2. These strategies and results present new insight into the design of all‐fluorescence WOLEDs with high efficiency, high CRI, and extended lifetime.

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Stable All‐Fluorescence White Organic Light‐Emitting Diodes with High Efficiency and High CRI

Xie,

Hu,

Qin

et al. 2024

Advanced Optical Materials

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Efficient all-fluorescence white organic light-emitting diodes with superior color stability and low efficiency roll-off employing matrix-free blue emitting layers

Liu,

Xue,

et al. 2024

J. Mater. Chem. C

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High-efficiency all fluorescence white OLEDs with high color rendering index by manipulating excitons in co-host recombination layers

Abstract: All fluorescence white organic light-emitting diodes (WOLEDs) based on thermally activated delayed fluorescence (TADF) emitters are an attractive route to realize highly efficient and high color quality white light sources....

Cited by 2 publications

References 45 publications

Stable All‐Fluorescence White Organic Light‐Emitting Diodes with High Efficiency and High CRI

Stable All‐Fluorescence White Organic Light‐Emitting Diodes with High Efficiency and High CRI

Efficient all-fluorescence white organic light-emitting diodes with superior color stability and low efficiency roll-off employing matrix-free blue emitting layers

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