Thermal buffer materials for enhancement of device performance of organic light emitting diodes fabricated by laser imaging process

Synthesis of Soluble Host Materials for Highly Efficient Red Phosphorescent Organic Light-Emitting Diodes

“…However, there are still lots of difficulties to achieve reliable and practical performances for the blue OLEDs. To overcome such an issue, “advanced hybrid device structure” has been suggested by Matsumoto et al, which utilizes BCL on the patterned red and green EMLs. − In other words, the hybrid process (e.g., solution + evaporation) architecture to obtain highly efficient solution processed phosphorescent OLEDs was proposed as follows: anode/HIL (solution process, polymers)/HTL (solution process, polymers or small molecules with cross-link units)/red or green EML (solution process, polymers or small molecules)/bipolar exciton blocking layer (B-EBL, vacuum deposition, small molecules)/blue EML (vacuum deposition, small molecules)/ETL (vacuum deposition, small molecules)/cathode. Hereat, the B-EBL plays very important role to suppress the triplet exciton migration toward blue EML which could result in side emission originated from the triplet–triplet annihilation inside blue EML as established in the previous reports. − …”

“…To overcome such an issue, "advanced hybrid device structure" has been suggested by Matsumoto, et al, which utilizes BCL on the patterned red and green EMLs. [23][24][25] In other words, the hybrid process (e.g. solution + evaporation) architecture to obtain highly efficient solution processed phosphorescent OLEDs was proposed as follows: anode / HIL (solution process, polymers) / HTL (solution process, polymers or small molecules with crosslink units) / red or green EML (solution process, polymers or small molecules) / bipolar exciton blocking layer (B-EBL, vacuum deposition, small molecules) / blue EML (vacuum deposition, small molecules) / ETL (vacuum deposition, small molecules) / cathode.…”

An indenocarbazole-based host material for solution processable green phosphorescent organic light emitting diodes

“…In addition, 10-(naphthalen-2-yl)-3-(phenanthren-9-yl)spiro[benzo [ij] tetraphene-7,9 0 -uorene] (blue host, BH) and N 6 ,N 9 -bis(4-cyanophenyl)-N 3 ,N 9 -diphenylspiro[benzo[de]anthracene-7,9 0 -uorene]-3,9-diamine (blue dopant, BD) supplied by Daejoo Electronic Materials Co., Ltd. were thermally evaporated for blue common layer (common EML). 16 Then, nally, 2,2 0 ,2 00 -(1,3,5-phenylene)tris(1-phenyl-1Hbenzimidazole) (TPBI, Sigma-Aldrich), 17 lithium uoride (LiF, Sigma-Aldrich) and aluminum (Al, Sigma-Aldrich) were successively deposited by thermal evaporation process.…”

Highly efficient organic light emitting diodes formed by solution processed red emitters with evaporated blue common layer structure

“…So far, the “advanced hybrid device structure approach” which allows limited numbers of solution processable materials is the representative method to achieve reasonable device performances for commercialization. Meanwhile, the utilization of a blue common layer which normally deposit the blue emitter on the patterned red and green EMLs 14 15 16 is very helpful to obtain the reasonable performances including lifetime because the soluble blue emitter has extremely short lifetime. In other words, we could ink-jet print HIL, HTL, red and green EMLs, and then successively deposit a bipolar exciton blocking layer (B-EBL), blue EML, ETL, EIL, and cathode by using a thermal evaporation process.…”