High efficiency yellow fluorescent organic light emitting diodes based on m-MTDATA/BPhen exciplex

doi:10.1007/s12200-015-0492-0

Front. Optoelectron.

2015, Vol. 8

Issue (4) : 439-444 https://doi.org/10.1007/s12200-015-0492-0

RESEARCH ARTICLE

High efficiency yellow fluorescent organic light emitting diodes based on m-MTDATA/BPhen exciplex

Liping ZHU,Kai XU,Yanping WANG,Jiangshan CHEN,Dongge MA(

)

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, University of the Chinese Academy of Sciences, Changchun 130022, China

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Abstract

High efficient yellow organic light emitting diodes (OLEDs) based on exciplex were reported. The exciplex was formed by 4, 4′, 4′′-tris [3-methylphenyl (phenyl) amino]-triphenylamine (m-MTDATA) and 4, 7-diphenyl-1, 10-phenanthroline (BPhen). The resulting yellow OLEDs exhibited an external quantum efficiency of over 7%, which is attributed to the effective energy back transfer from exciplex triplet state to exciplex singlet state. The maximum power efficiency of 25 lm/W was achieved. Doping a yellow phosphor Ir(bt)₂(acac) into m-MTDATA:BPhen blend, a high efficiency device was achieved with a turn-on voltage of 2.1 V, maximum power efficiency and external quantum efficiency of 86.1 lm/W and 20.7%, respectively.

Keywords organic light-emitting diodes (OLEDs) fluorescent exciplex

Corresponding Author(s): Dongge MA

Just Accepted Date: 04 June 2015 Online First Date: 30 June 2015 Issue Date: 24 November 2015

Cite this article:

Liping ZHU,Kai XU,Yanping WANG, et al. High efficiency yellow fluorescent organic light emitting diodes based on m-MTDATA/BPhen exciplex[J]. Front. Optoelectron., 2015, 8(4): 439-444.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-015-0492-0
https://academic.hep.com.cn/foe/EN/Y2015/V8/I4/439

Fig.1

(a) Normalized PL spectra of m-MTDATA (black line), BPhen (blue line) and m-MTDATA:BPhen (molar ratio of 1:1, orange line) at room temperature (RT) (solid line) and 77 K (dash dot line); (b) schematic diagram of device structure and its energy levels, and the chemical structures of m-MTDATA and BPhen are given in inset; (c) energy levels of m-MTDATA and BPhen, and their exciplex. S¹: singlet; T¹: triplet; S⁰: ground state; ISC: intersystem crossing; RISC: reverse intersystem crossing

Fig.2

Transient PL spectra of m-MTDAT (black), Bphen (blue) and m-MTDATA:BPhen (molar ratio of 1:1, red). Inset gives fluorescence decay lifetimes values that are recorded at exciting wavelength of 375 nm (in nanoseconds)

Fig.3

External quantum efficiencies (EQEs) (a) and power efficiencies (PEs) and (b) of the device 1 (black square), device 2 (red up triangle) and device 3 (blue down triangle). Solid lines in (a) are the fitting of TTA model

Fig.4

EL spectra of the three devices at a applied voltage of 4 V. Inset shows the EL spectra of device 2 at applied voltages from 3 to 8 V

Fig.5

Performance of Ir(bt)₂(acac) doped device: (a) current density-voltage-luminance properties; (b) power efficiency (PE) and external quantum efficiency (EQE); (c) EL spectrum at the driving voltage of 5 V

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