2013
DOI: 10.1063/1.4821881
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Interface and thickness tuning for blade coated small-molecule organic light-emitting diodes with high power efficiency

Abstract: We developed a general method based on fluorescence microscopy to characterize the interface dissolution in multi-layer organic light-emitting diodes (OLEDs) by blade coating. A sharp bi-layer edge was created before blade coating, with the bottom layer being insoluble and top layer soluble. After blade coating, fluorescence images showed that the edge of the top layer shifted when the layer dissolved completely, whereas the bottom layer's edge remained in place as a positioning mark. The dissolution depth was… Show more

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Cited by 13 publications
(5 citation statements)
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“…In the present study, heptane gave the best results, i.e., the most homogeneous and smooth films (Figure 1). For chlorobenzene, homogeneous films are obtained when deposited at RT and 50 • C. Chlorobenzene is the most common solvent for organic compounds, for either spin coating or doctor blade technique; in many reports, both the solution and substrate need to be heated at 30-70 • C before deposition [21][22][23][24][25]. The temperature is commonly used to induce solvent evaporation.…”
Section: Resultsmentioning
confidence: 99%
“…In the present study, heptane gave the best results, i.e., the most homogeneous and smooth films (Figure 1). For chlorobenzene, homogeneous films are obtained when deposited at RT and 50 • C. Chlorobenzene is the most common solvent for organic compounds, for either spin coating or doctor blade technique; in many reports, both the solution and substrate need to be heated at 30-70 • C before deposition [21][22][23][24][25]. The temperature is commonly used to induce solvent evaporation.…”
Section: Resultsmentioning
confidence: 99%
“…Kido and co-workers proposed the bipolar host material 2,6-bis­(3-(9 H -carbazol-9-yl)­phenyl)­pyridine (DCzPPy) with high triplet energy and carrier mobilities; upon doping with the phosphor emitter, iridium­(III) bis­(4,6-(difluorophenyl)­pyridinato-N,C2′)­picolinate (FIrpic), a vacuum-deposited blue phosphorescent OLED was obtained with a high efficiency and only slight efficiency roll-off . However, because of the deep highest occupied molecular orbital (HOMO) level of DCzPPy, an additional hole transport layer (HTL) with a suitable HOMO level was proposed in the device structure to promote hole injection. We also used DCzPPy as the host and 9-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)­phenyl]- N , N , N ′, N ′-tetraphenyl-9 H -carbazole-3,6-diamine (DACT-II) as the guest to fabricate the green emission TADF-OLED . In this device, we proposed a novel double-cross-linked HTL composed of N , N ′-bis­(4-(6-((3-ethyloxetan-3-yl)­methoxy))-hexylphenyl)- N , N ′-diphenyl-4,4′-diamine and N , N -bis­(4-(6-((3-ethyloxetan-yl)­methoxy)­hexyloxy)­phenyl)-3,5-di­(9 H -carbazol-9-yl)­benzenamine (Oxe-DCDPA) coated on top of PEDOT:PSS to form three stepwise increased HOMO levels for improving hole current injection as well as preventing exciton quench.…”
Section: Introductionmentioning
confidence: 99%
“…The details were similar to blade coating of organic layers and were reported elsewhere. [16][17][18][19][20][21][22][23] Smooth and uniform IGZO film can be obtained from blade speed below certain values. 24 In FIG.…”
Section: A Device Performancementioning
confidence: 99%