Optimization for tandem organic light-emitting diodes based on Firpic

Abstract

A series of single-unit and tandem blue phosphorescent organic light-emitting diodes (OLEDs) were prepared by adjusting the concentration of dopant based on the structure of ITO/NPB/EL unit/Alq₃/Cs₂CO₃/Al. The results show that tandem device with doping concentration of 10 wt% has appropriate energy transfer, which achieves the best performance with a maximum current efficiency of 3.4 cd·A⁻¹. Further study found that current efficiency and power efficiency of the tandem OLED adding BCP as hole blocking layer (HBL) can achieve 7.85 cd·A⁻¹ and 0.72 lm·W⁻¹, respectively. It is 2.88 times and 1.57 times larger than those of sing-unit devices, and green peak is restrained effectively.

Keywords

A

References

[1] Angel F A, Wallace J U, Tang C W. Organic Electronics. 2017, 42: 102

[2] Liu X, Wang C, Wang C, Irfan I, Gao Y. Organic Electronics. 2015, 17: 325

[3] Yang H-s, Kim J, Hosono H. Sid Symposium Digest of Technical Papers. 2017, 48: 1972

[4] Liu Y, Wu X-m, Xiao Z-h, Gao J, Zhang J, Yin S-g. Applied Surface Science. 2017, 413: 302

[5] Yang H-s, Kim J, Yamamoto K, Hosono H. Organic Electronics. 2017, 46: 133

[6] Huang C-c, Xie Y-m, Wu S-f, Li S-h, Liang J-j, Man K F. Physica Status Solidi. 2017, 214: 1700240

[7] Oliva J, Papadimitratos A, de la Rosa Cruz E, Zakhidov A. Physica Status Solidi. 2017, 214: 1700283

[8] Takayuki C, Pu Y-j, Kido J. Organic Light-Emitting Devices with Tandem Structure, Photoluminescent Materials and Electroluminescent Devices. 2017

[9] Nakatsuka S, Gotoh H, Kageyama A, Hatakeyama T. Organometallics. 2017, 36: 00242

[10] Wu Y-k, Sun Y, Qin H-y, Hu S-c, Wu Q-y, Yi Z. Applied Physics A. 2017, 123: 234

[11] Lei Y, Liu Z, Fan C-j, Peng X-f, Ji X, Li G-q, Xiong Z-h, Yang X-h. The Journal of Physical Chemistry C. 2017, 121: 793

[12] Deng Y-h, Wang J-j, Ou Q-d, Zhang D-y, Chen L-z, Li Y-q, Tang J-x. Organic Electronics. 2017, 51: 452

[13] Yan H, Huang Q, Cui J. Advanced Materials. 2003, 15: 835

[14] Wang Z, Zheng X, Liu F, Wang P, Gan L, Wang J-j. Optoelectronics Letters. 2017, 13: 325

[15] Xiao L-l, Chen Z-j, Qu B, Luo J-x, Kong S, Gong Q-h, Junji K. Advanced Materials. 2011, 23: 926

[16] Sun H-d, Guo Q-x, Yang D-z, Chen Y-h, Chen J-s, Ma D-g. ACS Photonics. 2015, 2: 271