Trisdibenzofuran-derived electron transport type exciton blocking materials for improved efficiency and lifetime in blue phosphorescent organic light-emitting diodes

Two trisdibenzofuran-derived compounds, 4,2′:8′,4′′-terdibenzo[b,d]furan (TDBF) and [4,2′:8′,4′′-terdibenzo[b,d]furan]-6,6′′-dicarbonitrile (CNTDBF), were developed and investigated as electron transport type exciton blocking materials of blue phosphorescent organic light-emitting diodes (PhOLEDs). TDBF was a trisdibenzofuran-type material without any substituent, and CNTDBF was a CN-modified trisdibenzofuran type material. The introduction of the trisdibenzofuran core provided a high triplet energy of more than 2.78 eV for use as an exciton blocking material in blue PhOLEDs, and the additional CN modification of the trisdibenzofuran moiety was effective for improved electron injection, electron transport and thermal stability and extension of the driving lifetime of the blue PhOLEDs. Among the two materials, CNTDBF provided a low driving voltage, a high quantum efficiency, a low efficiency roll-off and an extended lifetime.

[1]  Jun Yeob Lee,et al.  Benzoisoquinoline-1,3-dione acceptor based red thermally activated delayed fluorescent emitters , 2017 .

[2]  Jun Yeob Lee,et al.  Effect of interconnection position of bicarbazole-triazine type bipolar host materials on the photophysical and device performances , 2017 .

[3]  S. Forrest,et al.  Hot excited state management for long-lived blue phosphorescent organic light-emitting diodes , 2017, Nature Communications.

[4]  Jun Yeob Lee,et al.  Triplet emitter doped exciton harvesting layer for improved efficiency and long lifetime in blue phosphorescent organic light-emitting diodes , 2016 .

[5]  Tyler B Fleetham,et al.  Tetradentate Pt(II) Complexes with 6-Membered Chelate Rings: A New Route for Stable and Efficient Blue Organic Light Emitting Diodes , 2016 .

[6]  Yuanbin Kang,et al.  High triplet energy electron transport type exciton blocking materials for stable blue phosphorescent organic light-emitting diodes , 2016 .

[7]  Yong Joo Cho,et al.  Cool and warm hybrid white organic light-emitting diode with blue delayed fluorescent emitter both as blue emitter and triplet host , 2015, Scientific Reports.

[8]  Stephen R Forrest,et al.  Tenfold increase in the lifetime of blue phosphorescent organic light-emitting diodes , 2014, Nature Communications.

[9]  L. Liao,et al.  Highly efficient single-layer organic light-emitting devices based on a bipolar pyrazine/carbazole hybrid host material , 2014 .

[10]  Ming Zhou,et al.  Highly efficient phosphorescent organic light-emitting diodes using a homoleptic iridium(III) complex as a sky-blue dopant , 2013 .

[11]  Jun Yeob Lee,et al.  Organic Materials for Deep Blue Phosphorescent Organic Light‐Emitting Diodes , 2012, Advanced materials.

[12]  Julie J. Brown,et al.  Improved initial drop in operational lifetime of blue phosphorescent organic light emitting device fabricated under ultra high vacuum condition , 2011 .

[13]  Bo Qu,et al.  Recent Progresses on Materials for Electrophosphorescent Organic Light‐Emitting Devices , 2011, Advanced materials.

[14]  Zhaokui Wang,et al.  Bias and temperature dependent charge transport in solution-processed small molecular mixed single layer organic light emitting devices , 2011 .

[15]  Jingui Qin,et al.  Multifunctional Triphenylamine/Oxadiazole Hybrid as Host and Exciton‐Blocking Material: High Efficiency Green Phosphorescent OLEDs Using Easily Available and Common Materials , 2010 .

[16]  Junji Kido,et al.  Pyridine‐Containing Triphenylbenzene Derivatives with High Electron Mobility for Highly Efficient Phosphorescent OLEDs , 2008 .

[17]  Raymond Kwong,et al.  Graded mixed-layer organic light-emitting devices , 2002 .

[18]  S. Forrest,et al.  Nearly 100% internal phosphorescence efficiency in an organic light emitting device , 2001 .

[19]  Stephen R. Forrest,et al.  EXCITONIC SINGLET-TRIPLET RATIO IN A SEMICONDUCTING ORGANIC THIN FILM , 1999 .

[20]  Stephen R Forrest,et al.  Deep blue phosphorescent organic light-emitting diodes with very high brightness and efficiency. , 2016, Nature materials.