Title :
High efficiency single-doped white phosphorescent light-emitting diodes
Author :
Niu, Qiaoli ; Xu, Yunhua ; Peng, Junbiao ; Zhang, Yong
Author_Institution :
Dept. of Educ. of Guangdong Province, South China Normal Univ., Guangzhou, China
Abstract :
Efficient polymer white-light-emitting diodes (WPLEDs) have been fabricated with a single emissive layer, blue-green fluorescence polymer doped with a red phosphorescent dye. The device structure consists of ITO/poly(ehtlenedioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSS)/poly(N-vinylcarbazole) (PVK) /poly(9,9-dioctylfluorene) (PFO): Ir-complex (Ir(DMFPQ)2pbm) /CsF/Al. Energy transfer occurred from PFO to Ir(DMFPQ)2pbm, leading to electroluminescence quench of PFO. Pure and efficient white light emission was realized by tuning the weight ratio of PFO:Ir(DMFPQ)2pbm to 99.7: 0.3. The maximum current efficiency and luminance of WPLEDs were 9.6cd/A at 7.8V and 13491cd/m2 at 11.4V, respectively.
Keywords :
aluminium; caesium compounds; doping; dyes; electroluminescence; fluorescence; indium compounds; optical polymers; organic light emitting diodes; phosphorescence; quenching (thermal); tin compounds; ITO-CsF-Al; Ir-complex; blue-green fluorescence polymer; current efficiency; device structure; electroluminescence quenching; emissive layer; energy transfer; high efficiency single-doped light-emitting diodes; phosphorescent dye; poly(9,9-dioctylfluorene); poly(N-vinylcarbazole); poly(ehtlenedioxythiophene)-poly(styrene sulfonic acid); polymer white-light-emitting diodes; voltage 11.4 V; voltage 7.8 V; weight ratio tuning; white light emission; white phosphorescent light-emitting diodes; Color; Energy exchange; Organic light emitting diodes; Polymers; Substrates; organic electroluminescence; phosphorescence; polymer light-emitting diode; white;
Conference_Titel :
Advances in Optoelectronics and Micro/Nano-Optics (AOM), 2010 OSA-IEEE-COS
Conference_Location :
Guangzhou
Print_ISBN :
978-1-4244-8393-8
Electronic_ISBN :
978-1-4244-8392-1
DOI :
10.1109/AOM.2010.5713539
