Europium(II) Complex with d‐f Transition: New Emitter for Blue Light‐Emitting Electrochemical Cells with an External Quantum Efficiency of 19.8% DOI

Rubing Bai,

Peihao Huo,

Nanlong Zheng

и другие.

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 3, 2025

Light-emitting electrochemical cells (LECs) have good prospects in the solid-state lighting field due to their simple single-layer structure and low manufacturing cost. However, lack of high-efficiency blue LECs limits development further application. To solve this problem, many luminescent materials with various mechanisms such as fluorescence, phosphorescence, thermally-activated delayed fluorescence are studied emitters LECs. Besides these materials, herein lanthanide europium(II) (Eu(II)) complex d-f transition is demonstrated a new type emitter for In detail, emitting Eu(II) bis[hydrotris(3-tert-butylpyrazolyl)borate]europium(II) dispersed into 9-(3-(triphenylsilyl)phenyl)-9H-3,9'-bicarbazole host tetrahexylammonium tetrafluoroborate electrolyte make blend film, which attains high photoluminescence quantum yield ≈100%. The LEC using film an active layer achieves emission Commission Internationale de L'Eclairage coordinates (0.12, 0.18) record-breaking external efficiency 19.8%, corresponding exciton utilization This work reveals that promising toward high-performance LECs, can inspire research on based

Язык: Английский

Europium(II) Complex with d‐f Transition: New Emitter for Blue Light‐Emitting Electrochemical Cells with an External Quantum Efficiency of 19.8% DOI

Rubing Bai,

Peihao Huo,

Nanlong Zheng

и другие.

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 3, 2025

Light-emitting electrochemical cells (LECs) have good prospects in the solid-state lighting field due to their simple single-layer structure and low manufacturing cost. However, lack of high-efficiency blue LECs limits development further application. To solve this problem, many luminescent materials with various mechanisms such as fluorescence, phosphorescence, thermally-activated delayed fluorescence are studied emitters LECs. Besides these materials, herein lanthanide europium(II) (Eu(II)) complex d-f transition is demonstrated a new type emitter for In detail, emitting Eu(II) bis[hydrotris(3-tert-butylpyrazolyl)borate]europium(II) dispersed into 9-(3-(triphenylsilyl)phenyl)-9H-3,9'-bicarbazole host tetrahexylammonium tetrafluoroborate electrolyte make blend film, which attains high photoluminescence quantum yield ≈100%. The LEC using film an active layer achieves emission Commission Internationale de L'Eclairage coordinates (0.12, 0.18) record-breaking external efficiency 19.8%, corresponding exciton utilization This work reveals that promising toward high-performance LECs, can inspire research on based

Язык: Английский

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