Lifetime study of red phosphorescent organic light-emitting diodes with a double doping structure

Yook, Kyoung Soo; Jeon, Soon Ok; Kim, Oh Young; Lee, Jun Yeob

doi:10.1016/j.jiec.2010.05.007

Cited by 18 publications

(3 citation statements)

References 15 publications

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“…In addition, the luminances of A1-A5 are gradually enhanced with the increase of voltage, V, and 087302-2 the luminances of 6044, 9765, 11024, 41618, 40954 cd/m 2 are obtained at a bias of 13, respectively. As is well known, the hopping mechanism [6,7] in doped devices always plays a significant role in charge transport, with the increase of doping concentration, the hopping mechanism is more remarkable. To investigate the effects of (tbt) 2 Ir(acac) molecules on current density, performances of A1-A5 devices are investigated as shown in Table 1.…”

Section: Resultsmentioning

confidence: 96%

High-efficiency organic light-emitting diodes based on ultrathin blue phosphorescent modification layer

Zhu¹,

Zhong²,

Lei³

et al. 2017

Chinese Phys. B

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Yellow organic light-emitting devices (YOLEDs) with a novel structure of ITO/MoO 3 (5 nm)/NPB(40 nm)/ TCTA(15 nm)/CBP:(tbt) 2 Ir(acac)(x%)(25 nm)/FIrpic(y nm)/TPBi(35 nm)/Mg:Ag are fabricated. The ultrathin blue phosphorescent bis [(4,6-difluorophenyl)-pyridi-nato-N,C2 ](picolinate) iridium (III) (FIrpic) layer is regarded as a highperformance modification layer. By adjusting the thickness of FIrpic and the concentration of (tbt) 2 Ir(acac), a YOLED achieves a high luminance of 41618 cd/m 2 , power efficiency of 49.7 lm/W, current efficiency of 67.3 cd/A, external quantum efficiency (EQE) of 18%, and a low efficiency roll-off at high luminance. The results show that phosphorescent material of FIrpic plays a significant role in improving YOLED performance. The ultrathin FIrpic modification layer blocks excitons in EML. In the meantime, the high triplet energy of FIrpic (2.75 eV) alleviates the exciton energy transport from EML to FIrpic.

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Section: Resultsmentioning

confidence: 96%

High-efficiency organic light-emitting diodes based on ultrathin blue phosphorescent modification layer

Zhu¹,

Zhong²,

Lei³

et al. 2017

Chinese Phys. B

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“…Furthermore, it is investigated if OLED with an initially short lifetime can be improved by employing exciton transfer molecules to prevent the degradation of the host and red emitter. For fluorescent OLED it is known that the lifetime can be increased by employing exciton transfer molecules 12 and recent investigations 13 revealed that a similar effect probably is true for phosphorescent OLED as well.…”

mentioning

confidence: 88%

Employing exciton transfer molecules to increase the lifetime of phosphorescent red organic light emitting diodes

Lindla

Boesing

Gemmern

et al. 2011

Applied Physics Letters

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The lifetime of phosphorescent red organic light emitting diodes (OLEDs) is investigated employing either N,N′-diphenyl-N,N′-bis(1-naphthylphenyl)-1,1′-biphenyl-4,4′-diamine (NPB), TMM117, or 4,4′,4″-tris(N-carbazolyl)-triphenylamine (TCTA) as hole-conducting host material (mixed with an electron conductor). All OLED (organic vapor phase deposition-processed) show similar efficiencies around 30 lm/W but strongly different lifetimes. Quickly degrading OLED based on TCTA can be stabilized by doping exciton transfer molecules [tris-(phenyl-pyridyl)-Ir (Ir(ppy)3)] to the emission layer. At a current density of 50 mA/cm2 (12 800 cd/m2), a lifetime of 387 h can be achieved. Employing exciton transfer molecules is suggested to prevent the degradation of the red emission layer in phosphorescent white OLED.

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“…Organic light-emitting diodes (OLEDs) have received much attention in industry and academia because of their self-emission, fast response, flexibility, and full-color emission abilities [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. Research on organoboron emitters containing an oxygen atom or nitrogen atom as new emitter candidates has been strongly focused on blue emitters.…”

Section: Introductionmentioning

confidence: 99%

Organic–Inorganic Hybrid Device with a Novel Deep-Blue Emitter of a Donor–Acceptor Type, with ZnO Nanoparticles for Solution-Processed OLEDs

et al. 2022

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Two new deep-blue emitters with bipolar properties based on an organoboron acceptor and carbazole donor were newly synthesized: 2-(9H-carbazol-9-yl)-5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho [3,2,1-de]anthracen-7-yl)-5H-benzo[b]carbazole (TDBA-BCZ) and 5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho [3,2,1-de]anthracen-7-yl)-8-phenyl-5,8-dihydroindolo[2,3-c]carbazole (TDBA-PCZ). The two emitters showed deep-blue and real-blue photoluminescence emission in their solution and film states, respectively. The doped spin-coated films were prepared using synthesized materials and showed a root-mean-square roughness of less than 0.52 nm, indicating excellent surface morphology. The doped devices, fabricated via a solution process using TDBA-BCZ and TDBA-PCZ as the dopants, showed electroluminescence peaks at 428 and 461 nm, corresponding to the Commission Internationale de L’éclairage (CIE) coordinates of (0.161, 0.046) and (0.151, 0.155), respectively. The external quantum efficiency (EQE)/current efficiency (CE) of the solution-processed forward devices, with TDBA-BCZ and TDBA-PCZ as dopants, were 7.73%/8.67 cd/A and 10.58%/14.24 cd/A, respectively. An inverted OLED device fabricated using rod-shaped ZnO nanoparticles as an electron injection layer showed a CE of 1.09 cd/A and an EQE of 0.30%.

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Lifetime study of red phosphorescent organic light-emitting diodes with a double doping structure

Cited by 18 publications

References 15 publications

High-efficiency organic light-emitting diodes based on ultrathin blue phosphorescent modification layer

High-efficiency organic light-emitting diodes based on ultrathin blue phosphorescent modification layer

Employing exciton transfer molecules to increase the lifetime of phosphorescent red organic light emitting diodes

Organic–Inorganic Hybrid Device with a Novel Deep-Blue Emitter of a Donor–Acceptor Type, with ZnO Nanoparticles for Solution-Processed OLEDs

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