Electroluminescent Diodes Using Cyclohexane-Based Glass Forming Liquid Crystals and Their Analogues

AbstractOrganic electroluminescent(EL) diodes using spin-coat films of cyclohexane-based glass-forming liquid crystal (LC) materials were fabricated. The cyclohexane-based LC materials were found to be useful for EL diodes. Blending the LC materials with charge transport molecules was found to be a promising method for improving device performance. Conventional hole transport and electron transport molecules were found to show a tendency to form exciplexes with cyclohexanebased LC materials. This difficulty was overcome by the introduction of cyclohexane-based charge transport molecules. The EL quantum efficiency of 0.06% was attained in the single-layer devices with two-component blends.

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Modification of NiOx hole transport layer for acceleration of charge extraction in inverted perovskite solar cells

RSC Advances ◽

10.1039/d0ra00209g ◽

2020 ◽

Vol 10 (21) ◽

pp. 12289-12296 ◽

Cited By ~ 5

Author(s):

Zezhu Jin ◽

Yanru Guo ◽

Shuai Yuan ◽

Jia-Shang Zhao ◽

Xiao-Min Liang ◽

...

Keyword(s):

Solar Cells ◽

Energy Level ◽

Charge Transport ◽

Surface Property ◽

Perovskite Solar Cells ◽

Hole Transport ◽

Transport Layer ◽

Hole Transport Layer ◽

Device Performance ◽

Charge Extraction

The NiOx layer modified with NiOx nanoparticles obtains surface property optimization and energy level modulation, thus improving charge transport and device performance.

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Effects of Crystallinity of Hole Transport Layers on Organic Electroluminescent Device Performance

Japanese Journal of Applied Physics ◽

10.1143/jjap.30.l864 ◽

1991 ◽

Vol 30 (Part 2, No. 5A) ◽

pp. L864-L866 ◽

Cited By ~ 9

Author(s):

Hisashi Masui ◽

Manabu Takeuchi

Keyword(s):

Hole Transport ◽

Device Performance ◽

Electroluminescent Device ◽

Hole Transport Layers ◽

Organic Electroluminescent

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Nanoscale localized contacts for high fill factors in polymer-passivated perovskite solar cells

Science ◽

10.1126/science.abb8687 ◽

2021 ◽

Vol 371 (6527) ◽

pp. 390-395

Author(s):

Jun Peng ◽

Daniel Walter ◽

Yuhao Ren ◽

Mike Tebyetekerwa ◽

Yiliang Wu ◽

...

Keyword(s):

Solar Cells ◽

Electron Transport ◽

Charge Transport ◽

Perovskite Solar Cells ◽

Hole Transport ◽

Transport Layer ◽

Electron Transport Layer ◽

Hole Transport Layer ◽

Free Hole ◽

Trade Off

Polymer passivation layers can improve the open-circuit voltage of perovskite solar cells when inserted at the perovskite–charge transport layer interfaces. Unfortunately, many such layers are poor conductors, leading to a trade-off between passivation quality (voltage) and series resistance (fill factor, FF). Here, we introduce a nanopatterned electron transport layer that overcomes this trade-off by modifying the spatial distribution of the passivation layer to form nanoscale localized charge transport pathways through an otherwise passivated interface, thereby providing both effective passivation and excellent charge extraction. By combining the nanopatterned electron transport layer with a dopant-free hole transport layer, we achieved a certified power conversion efficiency of 21.6% for a 1-square-centimeter cell with FF of 0.839, and demonstrate an encapsulated cell that retains ~91.7% of its initial efficiency after 1000 hours of damp heat exposure.

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Blue Phosphorescent Organic Light-Emitting Devices with the Emissive Layer of mCP:FCNIr(pic)

Advances in Materials Science and Engineering ◽

10.1155/2012/192731 ◽

2012 ◽

Vol 2012 ◽

pp. 1-5 ◽

Cited By ~ 1

Author(s):

Ji Geun Jang ◽

Hyun Jin Ji

Keyword(s):

Electron Transport ◽

High Efficiency ◽

Single Layer ◽

Hole Transport ◽

Double Layers ◽

Light Emitting ◽

Emissive Layer ◽

Light Emitting Devices ◽

Hole Transport Layers ◽

The One

New high-efficiency blue-light-emitting phosphorescent devices with 300 Å-thick emissive layer of N,N′-dicarbazolyl-3,5-benzene [mCP] doped with 10 vol.% bis[(3,5-difluoro-4-cyanophenyl)pyridine]iridium picolinate [FCNIr(pic)] were fabricated with the different treatments of hole and electron transport layers. In the experiments, a single layer of 1,1-bis-(di-4-polyaminophenyl)cyclohexane [TAPC] and a double layer of N,N′-di(1-naphthyl)-N,N′-diphenylbenzidine [NPB] and mCP were used as hole transport layers (HTLs). In addition, 500 Å-thick double layers of tris-[3-(3-pyridyl)mesityl]borane [3TPYMB] and 4,7-diphenyl-1,10-phenanthroline [Bphen] were used as electron transport layers (ETLs) with various thickness combination of 3TPYMB/Bphen. Among the fabricated devices, the one using TAPC as an HTL and 3TPYMB(100 Å)/Bphen(400 Å) as an ETL showed best electroluminescent characteristics with a maximum quantum efficiency of 13.3% and a luminance of 950 cd/m2at 10 V. The color coordinates were (0.14, 0.22) on the Commission Internationale de I'Eclairage (CIE) chart, and the electroluminescent spectra showed the double-peak emissions at 458 nm and 483 nm.

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Development of liquid crystal light valves using Bi12SiO20 as the photoconductor. Part 2: Device performance

IEE Proceedings J Optoelectronics ◽

10.1049/ip-j.1986.0009 ◽

1986 ◽

Vol 133 (1) ◽

pp. 65

Author(s):

W.L. Baillie ◽

P.M. Openshaw ◽

A.D. Hart ◽

S.S. Makh

Keyword(s):

Liquid Crystal ◽

Device Performance

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Charge transport through extended molecular wires with strongly correlated electrons

Chemical Science ◽

10.1039/d1sc03050g ◽

2021 ◽

Author(s):

James O. Thomas ◽

Jakub K. Sowa ◽

Bart Limburg ◽

Xinya Bian ◽

Charalambos Evangeli ◽

...

Keyword(s):

Electron Transport ◽

Charge Transport ◽

Experimental Studies ◽

Strongly Correlated Electrons ◽

Molecular Wires ◽

Correlated Electrons ◽

Strongly Correlated

Experimental studies of electron transport through an edge-fused porphyrin oligomer in a graphene junction are interpreted within a Hubbard dimer framework.

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Study of a-Si:H/μc-Si:H Heterojunction as Photosensor for Large Screen Projection Display

MRS Proceedings ◽

10.1557/proc-258-1099 ◽

1992 ◽

Vol 258 ◽

Author(s):

Weiqiang Han ◽

Gaorong Han ◽

Jianmin Qiao ◽

Pija Du ◽

Danmei Zhao ◽

...

Keyword(s):

Liquid Crystal ◽

Glow Discharge ◽

Device Performance ◽

Blocking Layer ◽

Large Screen ◽

Cvd Method ◽

Projection Display ◽

Large Screen Projection ◽

Deposition Conditions ◽

Structure Properties

ABSTRACTLiquid crystal light valve(LCLV) using an a-Si:H/μc-Si:H heterostructure as the photosensor and the nematic liquid crystal as the modulator has been firstly presented for large screen projection display. The a-Si:H photoconductor and μc-Si:H light blocking layer were prepared by a modified glow discharge CVD method. The optoelectric and structure properties of the μc-Si:H films deposited at different deposition conditions have been studied. The a-Si:H film and the continuously deposited pc-Si:H film possibly form an a-Si:H/μc-Si:H heterojunction. The electrical and optoelectric properties of the heterojunction has been studied.LCLV using a-Si:H/μc-Si:H heterostructure has shown that the most aspects of the device performance can be improved.

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