RGB Recombination Zone Tuning to Improve Optical Characteristics of White Organic Light-Emitting Diodes

2015 ◽  
Vol 15 (5) ◽  
pp. 3697-3702
Author(s):  
Wook Song ◽  
Mei Meng ◽  
Kokwai Cheah ◽  
Fu Rong Zhu ◽  
Wooyoung Kim
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Optical Characteristics ◽  
Light Emitting ◽  
Organic Light ◽  
Recombination Zone

Direct monitoring of the recombination zone in highly efficient phosphorescent organic light-emitting diodes based on a high-doping concentration emitting system

2019 ◽  
Vol 7 (42) ◽  
pp. 13287-13293
Author(s):  
Jianan Xue ◽  
Jie Liang ◽  
Xinze Liu ◽  
Hao Zhang ◽  
Kaiqi Ye ◽  
...  
Keyword(s):  
Doping Concentration ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Highly Efficient ◽  
High Doping Concentration ◽  
Organic Light ◽  
System P ◽  
Recombination Zone

The high-content bipolar phosphor (ppy)2Ir(dipba) can dominate the EL process and the recombination zone is almost broadened as wide as the whole EML in D4, leading to remarkably higher efficiency level of D4 than that of D2 based on (ppy)2Ir(acac).

scholarly journals The recombination zone adjusted by the gradient doping of TPA-DCPP for efficient and stable deep red organic light emitting diodes

RSC Advances ◽  
2021 ◽  
Vol 11 (39) ◽  
pp. 24436-24442
Author(s):  
Qianmin Zhang ◽  
Jixin Jiang ◽  
Zheng Xu ◽  
Dandan Song ◽  
Bo Qiao ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Recombination Zone

Efficient deep red organic light-emitting diodes with 4.4% external quantum efficiency (EQE) and a stable electroluminescent spectrum at 674 nm.

scholarly journals Effects of the Thickness of N,N'-diphenyl-N,N'-di(m-tolyl)-benzidine on the Electro-Optical Characteristics of Organic Light-Emitting Diodes

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 966
Author(s):  
Sang-Geon Park ◽  
Won Jae Lee ◽  
Min Jong Song ◽  
Johngeon Shin ◽  
Tae Wan Kim
Keyword(s):  
Current Efficiency ◽  
Current Density ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Hole Transport ◽  
Organic Light Emitting Diodes ◽  
Optical Characteristics ◽  
Driving Voltage ◽  
Light Emitting ◽  
Organic Light

We examined the electro-optical characteristics of organic light emitting diodes according to the N,N'-diphenyl-N,N'-di(m-tolyl)-benzidine (TPD) thicknesses. The thicknesses of TPD were varied from 5 nm to 50 nm. The current density of the device with a TPD thickness of 5 nm was 8.94 times higher than that with a thickness of 50 nm at a driving voltage of 10 V. According to the conduction–current characteristics of conductors, the current densities improved with a decreasing TPD thickness. Different from the current density–voltage characteristics, the current efficiency–current density characteristics showed an improved efficiency with a 50 nm TPD thickness. The current efficiencies of a device with a 5 nm TPD thickness at a driving voltage of 10 V was 0.148 and at a 50 nm TPD thickness 0.993 cd/A, which was 6.7 times higher than the 5 nm TPD thickness. These results indicated that hole transport in Organic Light-Emitting Diode (OLED) devices were more efficient with thin 5 nm TPD than with thick 50 nm TPD, while electron transport was more efficient with thick 50 nm TPD, which caused conflicting results in the current efficiency-current density and current density-voltage characteristics according to TPD thicknesses.

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