Recent Advances in Organic Electroluminescent Materials and Devices

doi:10.11901/1005.3093.2014.724

Chinese Journal of Materials Research

2015, Vol. 29

Issue (5): 321-336 DOI: 10.11901/1005.3093.2014.724

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Recent Advances in Organic Electroluminescent Materials and Devices

Lian DUAN(

),Yong QIU(

)

Department of Chemistry, Tsinghua University, Beijing 100084, China

Cite this article:

Lian DUAN,Yong QIU. Recent Advances in Organic Electroluminescent Materials and Devices. Chinese Journal of Materials Research, 2015, 29(5): 321-336.

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Abstract

Since the invention of organic light-emitting diodes (OLEDs) by Dr. CW Tang in 1987, researches in related fields have been developed rapidly. Now, small to medium size OLED displays have already been commercialized. Large OLED TVs and OLED lightings have also emerged in real applications. The further development of the OLED technology calls for intensive research on organic light-emitting materials and devices. This report reviewed the most focused issues as well as the main progress in the field of OLEDs in the recent years. It is shown that researchers have paid attentions to both technical innovations and theoretical researches, such as the design of new molecules, developing of new device technology, and understanding of light-emitting and transporting mechanisms of organic semiconductors. The developing trends of organic light-emitting materials and devices are summarized as follows: 1) molecular design for high performance phosphorescent materials; 2) novel fluorescent materials and their light emitting mechanisms; 3) new technologies for high performance white OLEDs; 4) new technologies for solution-processed devices and flexible devices; 5) the influences of molecular packing, disorder and doping on the charge transporting properties of organic semiconductors. Moreover, the current situations and developing trends of international OLED display and lighting industries are discussed.

Key words: review organic light emitting diodes organic light-emitting materials light-emitting mechanisms charge transport in organic semiconductors

Received: 21 August 2014

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Fig.1 Molecular structures of some reported phosphorescent host materials based on phenylphosphine oxide groups^{[5-7, 9]}

Fig.2 Molecular structures of the reported phosphorescent host materials based on aromatic heterocyclic nitro groups^[10-15]

Fig.3 Molecular structures of the reported Pt and Ir based metal-organic complexes for phosphorescent emission^[16-19]

Fig.4 Molecular structures of the reported TTA delayed fluorescent materials^[20-25]

Fig.5 Molecular structures of the reported TADF materials^[26-28]

Fig.6 Diagram for TADF sensitized fluorescence based on host materials with small ΔE_ST^[31]

Fig.7 OLED device structures with solution-processed WO3/PEDOT: PSS as the hole transporting layers and performances of the devices^[49]

Fig.8 Wave guide mode and current efficiencies of the LEC device using nano-compounds as transparent anode^[52]

Fig.9 Printed flexible OLEDs fabricated by slot-die coating method^[56]

Table 1 Performances of white light OLEDs at Device level and Screen level (1000 cd/m²)

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