High-efficiency white organic light-emitting devices with a non-doped yellow phosphorescent emissive layer

Zhao, Juan; Yu, Junsheng; Xiao, Hongling; Hou, Menghan; Jiang, Yadong

doi:10.1016/j.tsf.2012.01.006

Cited by 14 publications

(6 citation statements)

References 36 publications

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“…The highest occupied molecular orbital (HOMO) of TAPC is higher than that of pentacene, and the lowest unoccupied molecular orbital (LUMO) of TAPC is lower than that of pentacene. 27,29 As previous works reported, once the conformation of heterojunction film is yielded, the system reaches thermal equilibrium by transferring charges to modulate the HOMO around the Fermi energy level E F , which could lead to a positive charge transfer. 9,30 In this work, a similar process likely occurred, i.e., charge can transfer from TAPC to pentacene and produce dipoles at the interface of the heterojunction film.…”

Section: Resultsmentioning

confidence: 90%

Discrepancies in performance for heterojunction organic field-effect transistors with different channel lengths

Huang

et al. 2012

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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Organic field-effect transistors (OFETs) with pentacene/1,1′-bis(di-4-tolylaminophenyl) cyclohexane heterojunction structures were fabricated, and semiconductor field-effect transistor characteristics were examined for heterojunction OFETs with different channel lengths to investigate discrepancies in threshold voltage. Compared with the OFETs with short channel length, the OFETs with long channel length demonstrated a much lower threshold voltage. The decrease in threshold voltage was attributed to the reduction of charge carrier traps, and trap variation for transistors with different channel lengths was studied in detail.

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Section: Resultsmentioning

confidence: 90%

Discrepancies in performance for heterojunction organic field-effect transistors with different channel lengths

Huang

et al. 2012

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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“…Hence, it is possible to simplify the structure without sacrificing the device performance by choosing appropriate material. However, few studies have been carried out on phosphorescent white OLEDs (PHWOLEDs) with simple structure [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Trilayer Phosphorescent Organic Light-Emitting Devices Without Electrode Modification Layer and Its Working Mechanism

et al. 2018

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At present, numerous functional layers are introduced to improve the carrier injection and balance the carrier transport in organic light-emitting devices (OLEDs). Although it may be a good way to enhance the efficiency of devices, the introduction of functional layers would also result in extra process and long manufacture period. Actually, with the enrichment of material system, many appropriate materials could be chosen to share two or even more functions in OLEDs. Here, via impedance spectroscopy and transient electroluminescence analysis, di-[4-(N,N-ditolyl-amino)-phenyl] cyclohexane (TAPC) and 4,7-diphenyl-1,10-phenanthroline (Bphen) are demonstrated to serve as carrier injection and transport layers simultaneously. As a result, efficient trilayer OLEDs are achieved with comparable performances to conventional multilayer devices. Further studies have also been carried out to analyze the recombination and quenching mechanisms in devices. TAPC can block electrons effectively, while Bphen avoids the accumulation of holes. It makes carriers in emitting layer become more balanced, resulting in the reduction of efficiency roll-off.

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“…In the last several years, the performance of OFET has been improved significantly by developing promising functional materials [6−9] and creating optimized device structures. [10−12] Among many advanced OFET structures, the organic semiconductor heterojunction is an effective architecture to improve the performance of OFET, [6,13,14] which has also been extensively utilized in organic light-emitting diodes (OLEDs) [15,16] and organic photovoltaic cells (OSCs). [17,18] The reason is that the heterojunction structure in OFET possesses the advantage of increasing the conductivity of the active layer, morphological matching between different organic films, and manipulating the interface molecular level alignment.…”

Section: Introductionmentioning

confidence: 99%

Enhanced charge carrier injection in heterojunction organic field-effect transistor by inserting an MoO ₃ buffer layer

Jun

Huang

et al. 2012

Chinese Phys. B

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A top-contact organic field-effect transistor (OFET) is fabricated by adopting a pentacene/1,1 ′ -bis(di-4tolylaminophenyl) cyclohexane (TAPC) heterojunction structure and inserting an MoO 3 buffer layer between the TAPC organic semiconductor layer and the source/drain electrode. The performances of the heterojunction OFET, including output current, field-effect mobility, and threshed voltage, are all significantly improved by introducing the MoO 3 thin buffer layer. The performance improvement of the modified heterojunction OFET is attributed to a better contact formed at the Au/TAPC interface due to the MoO 3 thin buffer layer, thereby leading to a remarkable reduction of the contact resistance at the metal/organic interface.

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High-efficiency white organic light-emitting devices with a non-doped yellow phosphorescent emissive layer

Cited by 14 publications

References 36 publications

Discrepancies in performance for heterojunction organic field-effect transistors with different channel lengths

Discrepancies in performance for heterojunction organic field-effect transistors with different channel lengths

Efficient Trilayer Phosphorescent Organic Light-Emitting Devices Without Electrode Modification Layer and Its Working Mechanism

Enhanced charge carrier injection in heterojunction organic field-effect transistor by inserting an MoO ₃ buffer layer

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High-efficiency white organic light-emitting devices with a non-doped yellow phosphorescent emissive layer

Cited by 14 publications

References 36 publications

Discrepancies in performance for heterojunction organic field-effect transistors with different channel lengths

Discrepancies in performance for heterojunction organic field-effect transistors with different channel lengths

Efficient Trilayer Phosphorescent Organic Light-Emitting Devices Without Electrode Modification Layer and Its Working Mechanism

Enhanced charge carrier injection in heterojunction organic field-effect transistor by inserting an MoO 3 buffer layer

Contact Info

Product

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Enhanced charge carrier injection in heterojunction organic field-effect transistor by inserting an MoO ₃ buffer layer