Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 18, Pages 15803-15811Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00729
Keywords
quantum dot light-emitting diodes; TBS-PBO; charge-transfer balance; electron-blocking layer; time-resolved PL
Funding
- Natural Science Foundation of China [11564026, 11774141, 61604120]
- China Scholarship Council [201608360030]
- Natural Science Foundation of Jiangxi Province [20171BCB23051, 20171BCB23052, 20171BAB202036, 20161BAB212035]
- Science and Technology Project of the Education Department of Jiangxi Province, China [GJJ160681]
Ask authors/readers for more resources
The electron-blocking layer (EBL) is important to balance the charge carrier transfer and achieve highly efficient quantum dot light-emitting diodes (QLEDs). Here, we report the utilization of a soluble tert-butyldimethylsilyl chloride-modified poly(p-phenylene benzobisoxazole) (TBS-PBO) as an EBL for simultaneous good charge carrier transfer balance while maintaining a high current density. We show that the versatile TBS-PBO blocks excess electron injection into the quantum dots (QDs), thus leading to better charge carrier transfer balance. It also restricts the undesired QD-to-EBL electron-transfer process, which preserves the superior emission capabilities of the emitter. As a consequence, the TBS-PBO device delivers an external quantum efficiency (EQE) maximum of 16.7% along with a remarkable current density as high as 139 mA/cm(2) with a brightness of 5484 cd/m(2). The current density of our device is higher than those of insulator EBL-based devices because of the higher conductivity of the TBS-PBO versus insulator EBL, thus helping achieve high luminance values ranging from 1414 to 20 000 cd/ cm(2) with current densities ranging from 44 to 648 mA/cm(2) and EQE > 14%. We believe that these unconventional features of the present TBS-PBO-based QLEDs will expand the wide use of TBS-PBO as buffer layers in other advanced QLED applications.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available