Thermally Activated Delayed Fluorescence Host for High Performance Organic Light-Emitting Diodes

Lu Zhang; Kok Wai Cheah

doi:10.1038/s41598-018-27238-y

Thermally Activated Delayed Fluorescence Host for High Performance Organic Light-Emitting Diodes

Lu Zhang
, Kok Wai Cheah^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › peer-review

38 Citations (Scopus)

Abstract

Thermally activated delayed florescence (TADF) materials can be an efficient host in organic LED (OLED). It is because it is possible to couple energetically the emission energy level of a dopant to the energy levels in the TADF material. In this work fluorescent emitters 2,3,6,7-tetrahydro-1,1,7,7,-tetramethyl-1H,5 H,11H-10-(2-benzothiazolyl)quinolizino-9,9a,1gh coumarin (c545t) and 5,6,11,12-tetraphenyltetracene (rubrene) were used as dopants in a blended TADF host; tris(4-carbazoyl-9-ylphenyl)amine (TCTA) with 2,4,6-tris(3′-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine (Tm3PyBPZ). The blended TADF host has an energy difference between the singlet and triplet excited states (ΔE_ST) around 27 meV with the yield of reverse intersystem crossing (Φ_RISC) nearly 100%. This high Φ_RISC yield enhances the OLED performance with the c545t doped OLED having 11.9% external quantum efficiency and 10% for the rubrene doped OLED.

Original language	English
Article number	8832
Journal	Scientific Reports
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41598-018-27238-y
Publication status	Published - 1 Dec 2018

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@article{a34bb0146486469fbcdec3eb9f320d7e,

title = "Thermally Activated Delayed Fluorescence Host for High Performance Organic Light-Emitting Diodes",

abstract = "Thermally activated delayed florescence (TADF) materials can be an efficient host in organic LED (OLED). It is because it is possible to couple energetically the emission energy level of a dopant to the energy levels in the TADF material. In this work fluorescent emitters 2,3,6,7-tetrahydro-1,1,7,7,-tetramethyl-1H,5 H,11H-10-(2-benzothiazolyl)quinolizino-9,9a,1gh coumarin (c545t) and 5,6,11,12-tetraphenyltetracene (rubrene) were used as dopants in a blended TADF host; tris(4-carbazoyl-9-ylphenyl)amine (TCTA) with 2,4,6-tris(3′-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine (Tm3PyBPZ). The blended TADF host has an energy difference between the singlet and triplet excited states (ΔEST) around 27 meV with the yield of reverse intersystem crossing (ΦRISC) nearly 100\%. This high ΦRISC yield enhances the OLED performance with the c545t doped OLED having 11.9\% external quantum efficiency and 10\% for the rubrene doped OLED.",

author = "Lu Zhang and Cheah, \{Kok Wai\}",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s).",

year = "2018",

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doi = "10.1038/s41598-018-27238-y",

language = "English",

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AU - Zhang, Lu

AU - Cheah, Kok Wai

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N2 - Thermally activated delayed florescence (TADF) materials can be an efficient host in organic LED (OLED). It is because it is possible to couple energetically the emission energy level of a dopant to the energy levels in the TADF material. In this work fluorescent emitters 2,3,6,7-tetrahydro-1,1,7,7,-tetramethyl-1H,5 H,11H-10-(2-benzothiazolyl)quinolizino-9,9a,1gh coumarin (c545t) and 5,6,11,12-tetraphenyltetracene (rubrene) were used as dopants in a blended TADF host; tris(4-carbazoyl-9-ylphenyl)amine (TCTA) with 2,4,6-tris(3′-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine (Tm3PyBPZ). The blended TADF host has an energy difference between the singlet and triplet excited states (ΔEST) around 27 meV with the yield of reverse intersystem crossing (ΦRISC) nearly 100%. This high ΦRISC yield enhances the OLED performance with the c545t doped OLED having 11.9% external quantum efficiency and 10% for the rubrene doped OLED.

AB - Thermally activated delayed florescence (TADF) materials can be an efficient host in organic LED (OLED). It is because it is possible to couple energetically the emission energy level of a dopant to the energy levels in the TADF material. In this work fluorescent emitters 2,3,6,7-tetrahydro-1,1,7,7,-tetramethyl-1H,5 H,11H-10-(2-benzothiazolyl)quinolizino-9,9a,1gh coumarin (c545t) and 5,6,11,12-tetraphenyltetracene (rubrene) were used as dopants in a blended TADF host; tris(4-carbazoyl-9-ylphenyl)amine (TCTA) with 2,4,6-tris(3′-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine (Tm3PyBPZ). The blended TADF host has an energy difference between the singlet and triplet excited states (ΔEST) around 27 meV with the yield of reverse intersystem crossing (ΦRISC) nearly 100%. This high ΦRISC yield enhances the OLED performance with the c545t doped OLED having 11.9% external quantum efficiency and 10% for the rubrene doped OLED.

UR - https://www.scopus.com/pages/publications/85048342122

U2 - 10.1038/s41598-018-27238-y

DO - 10.1038/s41598-018-27238-y

M3 - Journal article

C2 - 29891928

AN - SCOPUS:85048342122

SN - 2045-2322

VL - 8

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ER -

Thermally Activated Delayed Fluorescence Host for High Performance Organic Light-Emitting Diodes

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