Efficient exciton generation in atomic passivated CdSe/ZnS quantum dots light-emitting devices.
We demonstrate the first-ever surface modification of green CdSe/ZnS quantum dots (QDs) using bromide anions (Br-) in cetyl trimethylammonium bromide (CTAB). The Br-ions reduced the interparticle spacing between the QDs and induced an effective charge balance in QD light-emitting devices (QLEDs). The fabricated QLEDs exhibited efficient charge injection because of the reduced emission quenching effect and their enhanced thin film morphology. As a result, they exhibited a maximum luminance of 71,000 cd/m2and an external current efficiency of 6.4 cd/A, both significantly better than those of their counterparts with oleic acid surface ligands. In addition, the lifetime of the Br- treated QD based QLEDs is significantly improved due to ionic passivation at the QDs surface.
Center for Functional Devices Fusion Platform, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.
Byoung-Ho
BH
Kang
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.
Jae-Sung
JS
Lee
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.
Sang-Won
SW
Lee
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.
Sae-Wan
SW
Kim
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.
Jun-Woo
JW
Lee
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.
Sai-Anand
SA
Gopalan
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.
Ji-Sub
JS
Park
Department of Electronic Engineering, Kyungil University, Buho-ri, Hayang-eup, 712-701 Gyeongsan-si, Republic of Korea.
Dae-Hyuk
DH
Kwon
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.
Jin-Hyuk
JH
Bae
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.
Hak-Rin
HR
Kim
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.
Shin-Won
SW
Kang
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