A pure blue emitter (CIEy ≈ 0.08) of chrysene derivative with high thermal stability for OLED

Chung, Yi‐Chang; Sheng, Lei; Xing, Xing; Zheng, Lingling; Bian, Mengying; Chen, Zhijian; Xiao, Lixin; Gong, Qihuang

doi:10.1039/c4tc02669a

Cited by 50 publications

(12 citation statements)

References 33 publications

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“…10,11 OLEDs which emit from the deep blue / violet region of the spectrum, especially with Commission Internationale de l´Eclairage (CIE) coordinates that match the National Television System Committee (NTSC) standard blue CIE (x,y) (0.14, 0.08) have been the subject of increased investigation to meet the demands of high quality displays. 12,13,14,15,16,17,18,19,20,21 Maximum external quantum efficiencies (EQEs) as high as 3-6% for emission peaks in the range 400-480 nm have been achieved for a range of small molecule based devices through rational molecular design. 12,21 However, efficient deep blue polymeric emitters in simple device architectures remain under-developed.…”

Section: Introductionmentioning

confidence: 99%

High brightness deep blue/violet fluorescent polymer light-emitting diodes (PLEDs)

et al. 2015

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Section: Introductionmentioning

confidence: 99%

High brightness deep blue/violet fluorescent polymer light-emitting diodes (PLEDs)

et al. 2015

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“…Although one peak in TAPC film is close to 460 nm, it is believed to be the excimer of TAPC , which can be reduced greatly in the blend of TAPC and TpPyPB. Thus, the 480‐nm peak in the EL of device I originates from exciplex formed between TAPC and TpPyPB, while the 580 and 692 nm peaks originate from electroplex emission, as they were undetectable in PL .…”

Section: Resultsmentioning

confidence: 97%

Micromechanism of electroplex formation

Wei

Gui

Chung

et al. 2015

Phys. Status Solidi B

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In this work, we have provided a new possible explanation for the micromechanism of electroplex. The time-resolved electroluminescent spectra of light-emitting diodes based on the blend of TAPC and TpPyPB were measured. They show that when a high bias voltage is applied on the devices, the electroplex emission gradually increases over time. After the devices worked at a high bias voltage, a strong electroplex emission can be maintained at low bias voltage, but the peaks related to the electroplex are still insignificant in photoluminescence. These results may suggest that the electroplex is a charge-transfer complex with changed conformation caused by polaron-induced molecular aggregation under electric field in essence, though further investigation is needed. Using materials with morphology stability under an electric field, electroplex was greatly reduced, which may enlarge the consideration in designing exciplex-based organic light-emitting diodes (ExOLEDs).

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“…Based on the above effective attempts, we continue designing twisted structured emitter 6,12‐bis(9‐phenyl‐9H‐carbazol‐3‐yl)chrysene (BPCC) which combines chrysene with carbazole groups to suppress crystallization (as shown in Figure ). The BPCC based device achieved a η ext, max of 4.9 % with CIE (0.16, 0.08) …”

Section: Molecular Design For Deep Blue Emittersmentioning

confidence: 99%

Highly Efficient Organic Blue Electroluminescent Materials and Devices with Mesoscopic Structures

Bian

Chen

Xiao

2018

The Chemical Record

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Due to the difficulty in achieving high efficiency and high color purity simultaneously, blue emission is the limiting factor for the performance and stability of OLEDs. Since 2003, we have been working on organic light-emitting diodes (OLEDs), especially on blue light. After a series of molecular designs, novel strategies have been proposed from different aspects. At first, highly efficient deep blue emission could be achieved through molecular design with highly twisted structure to suppress fluorescence quenching and redshift. Deep blue emitters with high efficiency in solid state, a twisted structure with aggregation induced emission (AIE) characteristics was incorporated to inhibit molecular aggregation, and triplet-triplet fusion (TTF) and hybridized localized charge transfer (HLCT) were adopted to increase the ratio of triplet exciton used. Secondly, a highly efficient blue OLED could be achieved through improving charge transport. New electron transport materials (ETMs) with wide band gap were developed to control charge transport balance in devices. Thirdly, a highly efficient deep blue emission could be achieved through a mesoscopic structure of out-coupling layer. A mesoscopic photonic structured organic thin film was fabricated on the top of metal electrode by self-aggregation in order to improve the light out-coupling efficiency.

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A pure blue emitter (CIEy ≈ 0.08) of chrysene derivative with high thermal stability for OLED

Abstract: A chrysene derivative, BPCC (6,12-bis(9-phenyl-9H-carbazol-3-yl)chrysene), possessing high thermal stability with a high glass transition temperature (Tg = 181 °C) was synthesized.

Cited by 50 publications

References 33 publications

High brightness deep blue/violet fluorescent polymer light-emitting diodes (PLEDs)

High brightness deep blue/violet fluorescent polymer light-emitting diodes (PLEDs)

Micromechanism of electroplex formation

Highly Efficient Organic Blue Electroluminescent Materials and Devices with Mesoscopic Structures

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