Effect of various host characteristics on blue thermally activated delayed fluorescent devices

Dae Hyun Ahn; Ji Su Moon; Si Woo Kim; Seung Yeon Lee; Durai Karthik; Ju Young Lee; Jang Hyuk Kwon

doi:10.1016/j.orgel.2018.04.034

Effect of various host characteristics on blue thermally activated delayed fluorescent devices

Dae Hyun Ahn, Ji Su Moon, Si Woo Kim, Seung Yeon Lee, Durai Karthik, Ju Young Lee, Jang Hyuk Kwon

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

Two bipolar hosts consisting of phosphine oxide and carbazole, (9-phenyl-9H-carbazole-3,6-diyl)bis (diphenylphosphine oxide) (PPO2) and phenylbis (9-phenyl-9H-carbazol-3-yl)phosphine oxide (3DCPO) generally used as blue phosphorescence hosts are successively applied to blue thermally activated delayed fluorescence (TADF) organic light emitting diodes (OLEDs). These hosts have suitable high triplet energy (T₁) and bipolar characteristics expecting increase in TADF characteristics of dopant. The exciton decay rate and photoluminance quantum yield (PLQY) of the dopant according to the polarity of host are analyzed. It is shown that the host, PPO2, with appropriate polarity increased the TADF characteristics of the dopant and efficiency of OLED. The PPO2 based blue TADF OLED shows a high external quantum efficiency of 27.8% achieving enhanced efficiency roll-off characteristic.

Original language	English
Pages (from-to)	39-44
Number of pages	6
Journal	Organic Electronics
Volume	59
DOIs	https://doi.org/10.1016/j.orgel.2018.04.034
Publication status	Published - Aug 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

Blue host
Host polarity
Organic light-emitting diode
Thermally activated delayed fluorescence

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10.1016/j.orgel.2018.04.034

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title = "Effect of various host characteristics on blue thermally activated delayed fluorescent devices",

abstract = "Two bipolar hosts consisting of phosphine oxide and carbazole, (9-phenyl-9H-carbazole-3,6-diyl)bis (diphenylphosphine oxide) (PPO2) and phenylbis (9-phenyl-9H-carbazol-3-yl)phosphine oxide (3DCPO) generally used as blue phosphorescence hosts are successively applied to blue thermally activated delayed fluorescence (TADF) organic light emitting diodes (OLEDs). These hosts have suitable high triplet energy (T1) and bipolar characteristics expecting increase in TADF characteristics of dopant. The exciton decay rate and photoluminance quantum yield (PLQY) of the dopant according to the polarity of host are analyzed. It is shown that the host, PPO2, with appropriate polarity increased the TADF characteristics of the dopant and efficiency of OLED. The PPO2 based blue TADF OLED shows a high external quantum efficiency of 27.8% achieving enhanced efficiency roll-off characteristic.",

keywords = "Blue host, Host polarity, Organic light-emitting diode, Thermally activated delayed fluorescence",

author = "Ahn, {Dae Hyun} and Moon, {Ji Su} and Kim, {Si Woo} and Lee, {Seung Yeon} and Durai Karthik and Lee, {Ju Young} and Kwon, {Jang Hyuk}",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

month = aug,

doi = "10.1016/j.orgel.2018.04.034",

language = "English",

volume = "59",

pages = "39--44",

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T1 - Effect of various host characteristics on blue thermally activated delayed fluorescent devices

AU - Ahn, Dae Hyun

AU - Moon, Ji Su

AU - Kim, Si Woo

AU - Lee, Seung Yeon

AU - Karthik, Durai

AU - Lee, Ju Young

AU - Kwon, Jang Hyuk

PY - 2018/8

Y1 - 2018/8

N2 - Two bipolar hosts consisting of phosphine oxide and carbazole, (9-phenyl-9H-carbazole-3,6-diyl)bis (diphenylphosphine oxide) (PPO2) and phenylbis (9-phenyl-9H-carbazol-3-yl)phosphine oxide (3DCPO) generally used as blue phosphorescence hosts are successively applied to blue thermally activated delayed fluorescence (TADF) organic light emitting diodes (OLEDs). These hosts have suitable high triplet energy (T1) and bipolar characteristics expecting increase in TADF characteristics of dopant. The exciton decay rate and photoluminance quantum yield (PLQY) of the dopant according to the polarity of host are analyzed. It is shown that the host, PPO2, with appropriate polarity increased the TADF characteristics of the dopant and efficiency of OLED. The PPO2 based blue TADF OLED shows a high external quantum efficiency of 27.8% achieving enhanced efficiency roll-off characteristic.

AB - Two bipolar hosts consisting of phosphine oxide and carbazole, (9-phenyl-9H-carbazole-3,6-diyl)bis (diphenylphosphine oxide) (PPO2) and phenylbis (9-phenyl-9H-carbazol-3-yl)phosphine oxide (3DCPO) generally used as blue phosphorescence hosts are successively applied to blue thermally activated delayed fluorescence (TADF) organic light emitting diodes (OLEDs). These hosts have suitable high triplet energy (T1) and bipolar characteristics expecting increase in TADF characteristics of dopant. The exciton decay rate and photoluminance quantum yield (PLQY) of the dopant according to the polarity of host are analyzed. It is shown that the host, PPO2, with appropriate polarity increased the TADF characteristics of the dopant and efficiency of OLED. The PPO2 based blue TADF OLED shows a high external quantum efficiency of 27.8% achieving enhanced efficiency roll-off characteristic.

KW - Blue host

KW - Host polarity

KW - Organic light-emitting diode

KW - Thermally activated delayed fluorescence

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U2 - 10.1016/j.orgel.2018.04.034

DO - 10.1016/j.orgel.2018.04.034

M3 - Article

AN - SCOPUS:85046138793

SN - 1566-1199

VL - 59

SP - 39

EP - 44

JO - Organic Electronics

JF - Organic Electronics

ER -

Effect of various host characteristics on blue thermally activated delayed fluorescent devices

Abstract

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Keywords

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