Breaking the Efficiency Limit of Fluorescent OLEDs by Hybridized Local and Charge-Transfer Host Materials

被引：86

作者：

Chen, Lingfeng ^{[1
,2
]}

Zhang, Shitong ^{[3
]}

Li, Hui ^{[1
,2
]}

Chen, Runfeng ^{[1
,2
]}

Jin, Lu ^{[1
,2
]}

Yuan, Kai ^{[1
,2
]}

Li, Huanhuan ^{[1
,2
]}

Lu, Ping ^{[3
]}

Yang, Bing ^{[3
]}

Huang, Wei ^{[4
,5
]}

机构：

[1] Nanjing Univ Posts & Telecommun, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, Inst Adv Mat, Key Lab Organ Elect & Informat Displays, 9 Wenyuan Rd, Nanjing 210023, Jiangsu, Peoples R China

[2] Nanjing Univ Posts & Telecommun, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, Inst Adv Mat, Jiangsu Key Lab Biosensors, 9 Wenyuan Rd, Nanjing 210023, Jiangsu, Peoples R China

[3] Jilin Univ, State Key Lab Supramol Struct & Mat, Changchun 130012, Jilin, Peoples R China

[4] Nanjing Tech Univ, Natl Synergist Innovat Ctr Adv Mat, Key Lab Flexible Elect, 30 South Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China

[5] Nanjing Tech Univ, Natl Synergist Innovat Ctr Adv Mat, Inst Adv Mat, 30 South Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2018年 / 9卷 / 18期

基金：

中国国家自然科学基金;

关键词：

LIGHT-EMITTING-DIODES; ACTIVATED DELAYED FLUORESCENCE; HIGHLY EFFICIENT; RADIATIVE EXCITONS; MOLECULAR DESIGN; ROLL-OFF; DEVICES; EMITTERS; STATE; ELECTROLUMINESCENCE;

D O I：

10.1021/acs.jpclett.8b02138

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Hybridized local and charge-transfer (HLCT) states with "hot exciton" properties are effective in harvesting high-lying triplet excitons for electroluminescence in organic light-emitting diodes (OLEDs). Here, we propose a technique based on the HLCT mechanism at the high-lying excited states to develop HLCT-sensitized fluorescent (HLCT-SF) OLEDs using HLCT host molecules and metal-free fluorescent dopants for highly efficient OLEDs. A maximum external quantum efficiency (EQE) up to 6.3% and an exciton utilizing efficiency (EUE) of 64% were achieved, apparently exceeding the upper limits of the EQE (5%) and EUE (25%) in conventional fluorescent OLEDs. The HLCT-SF process via long-range Forster resonance energy transfer from the singlet excited states of the HLCT host to that of the fluorescent guest is efficient in harvesting "hot triplet excitons" by efficient high-lying reverse intersystem crossing, and the newly proposed HLCT-SF OLEDs represent an important advance in realizing high-performance OLEDs.

引用

页码：5240 / 5245

页数：11

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