Highly efficient blue fluorescent OLEDs with doped double emitting layers based on p-n heterojunctions

We fabricate a kind of novel efficient blue fluorescent organic light emitting device（OLED） based on p-n heterojunctions composed of hole transporting layer（HTL） N,N ＇-bis（naphthalen-1-yl）-N,N ＇-bis（phenyl）-benzidine（NPB） and electron transporting layer（ETL） 4,7-diphnenyl-1,10-phenanthroline（BPhen）,...

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Published inChinese physics B Vol. 21; no. 5; pp. 681 - 685
Main Author 苏跃举 吴晓明 华玉林 申利莹 焦志强 董木森 印寿根
Format Journal Article
LanguageEnglish
Published 01.05.2012
Subjects
Derivation
Devices
Electric potential
Emittance
Fluorescence
Heterojunctions
Luminance
OLED
Transporting
Voltage
发光层
异质结
掺杂
有机发光器件
电致发光特性
空穴传输层
蓝色荧光
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/21/5/058503

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Summary:We fabricate a kind of novel efficient blue fluorescent organic light emitting device（OLED） based on p-n heterojunctions composed of hole transporting layer（HTL） N,N ＇-bis（naphthalen-1-yl）-N,N ＇-bis（phenyl）-benzidine（NPB） and electron transporting layer（ETL） 4,7-diphnenyl-1,10-phenanthroline（BPhen）,into which a new blue material,DNCA（a derivation of N 6,N 6,N 12,N 12-tetrap-tolylchrysene-6,12-diamine）,is partially doped simultaneously,and double emitting layers are configured.With a turn-on voltage of 2.6 V at 1 cd/m 2,this type of OLED presents a maximum luminance efficiency（η max） of 8.83 cd/A at 5.818 mA/cm 2 and a maximum luminance of over 40000 cd/m 2.Meanwhile,the Commission Internationale De L＇Eclairage（CIE） coordinates of this device change slightly from（0.13,0.27） to（0.13,0.23） as the driving voltage increases from 3 V to 11 V.This improvement in the electroluminescent characteristics is attributed mainly to the ideal p-n heterojunction which can confine and distribute excitons evenly on two sides of the heterojunction interface so as to improve the carrier combination rate and expand the light-emitting region.
Bibliography:Su Yue-Ju ,Wu Xiao-Ming ,Hua Yu-Lin ,Shen Li-Ying ,Jiao Zhi-Qiang ,Dong Mu-Sen ,and Yin Shou-Gen a） School of Materials Science ＆ Engineering,Tianjin University of Technology,Tianjin 300384,China b） Key Laboratory of Display Materials ＆ Photoelectric Devices of Ministry of Education,Tianjin University of Technology,Tianjin 300384,China c） Tianjin Key Laboratory for Photoelectric Materials ＆ Devices,Tianjin University of Technology,Tianjin 300384,China
heterojunction; organic light-emitting diodes; exciplex emission; double emitting layers
We fabricate a kind of novel efficient blue fluorescent organic light emitting device（OLED） based on p-n heterojunctions composed of hole transporting layer（HTL） N,N ＇-bis（naphthalen-1-yl）-N,N ＇-bis（phenyl）-benzidine（NPB） and electron transporting layer（ETL） 4,7-diphnenyl-1,10-phenanthroline（BPhen）,into which a new blue material,DNCA（a derivation of N 6,N 6,N 12,N 12-tetrap-tolylchrysene-6,12-diamine）,is partially doped simultaneously,and double emitting layers are configured.With a turn-on voltage of 2.6 V at 1 cd/m 2,this type of OLED presents a maximum luminance efficiency（η max） of 8.83 cd/A at 5.818 mA/cm 2 and a maximum luminance of over 40000 cd/m 2.Meanwhile,the Commission Internationale De L＇Eclairage（CIE） coordinates of this device change slightly from（0.13,0.27） to（0.13,0.23） as the driving voltage increases from 3 V to 11 V.This improvement in the electroluminescent characteristics is attributed mainly to the ideal p-n heterojunction which can confine and distribute excitons evenly on two sides of the heterojunction interface so as to improve the carrier combination rate and expand the light-emitting region.
11-5639/O4
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/5/058503