High-performing D-π-A-π-D benzothiadiazole-based hybrid local and charge-transfer emitters in solution-processed OLEDs

Article abstract of DOI:10.1039/d0tc04080k

Transforming triplet excitons into singlet excitons is a topic of great interest to material scientists in order to surpass the exciton utilization efficiency (EUE) limit of 25% in electro-fluorescent devices. Towards this goal, the donor-acceptor strategy of molecular design has been proven to be an effective approach to obtain high electroluminescence (EL) efficiency. In this context, herein, we report two benzothiadiazole (BTD)-based donor-acceptor π-conjugated fluorescent molecules, 1 and 2, which exhibited an external quantum efficiency (EQE) as high as 7.0% and 8.1%, respectively, in solution-processed doped green OLED devices. The observed high photoluminescence (PL) quantum yield of 81% for 1 and 85% for 2 corroborate the high EUE values of 43% and 48%, respectively, exceeding the traditional limit (25%), hence suggest the utilization of triplet excitons. The reported emitters combine two parameters, i.e. high PL efficiency and high EUE, which are of key importance to harvest maximum EL in OLED devices. Based on the photophysical (solvatochromic experiment) and quantum chemical calculations, the impacts of the D-π-A-π-D molecular design on the regulation of the locally excited and charge transfer components were revealed, which explained the observed high EQE (>5%) and EUE (>25%) values for the BTD-based emitters. The development of emitters with a hybrid local and charge transfer state in combination with the 'hot exciton' mechanism is an important strategy to produce highly efficient fluorescent-emitter materials. Besides the impressive EL properties of the emitters, the studied compound 1 as a chemosensor showed the selective sensing of metal cation (Fe2+) and anion (I-) together with the staining agent of Hibiscus rosa-sinensis pollen grains.

Full text of DOI:10.1039/d0tc04080k

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Materials Chemistry C
Materials for optical, magnetic and electronic devices
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Yadav, M. Devi, J. De, N. Singh, K. Kailasam, J. Jayakumar, J. Jou, C. Cheng and S. K. Pal, J. Mater. Chem.
C, 2020, DOI: 10.1039/D0TC04080K.
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February 2018
Pages 911-1266
Journal of
Materials Chemistry C
Materials for optical, magnetic and electronic devices
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ISSN 2050-7526
PAPER
Nosang V. Myung, Yong-Ho Choa et al.
A
noble gas sensor platform: linear dense assemblies of
a multi-layered
single-walled carbon nanotubes (LACNTs) in
ceramic/metal electrode system (MLES)
rsc.li/materials-c

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Journal of Materials Chemistry C
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DOI: 10.1039/D0TC04080K

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DOI: 10.1039/D0TC04080K
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&'()*( +, -,. )+/0*. 1)234-*
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DOI: 10.1039/D0TC04080K
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&'()*( +, -,. )+/0*. 1)234-*
Journal of Materials Chemistry C
Page 6 of 8
View Article Online
DOI: 10.1039/D0TC04080K
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A:,. ?(1+&.= ;7B_= =O= XBE^PX;7_C
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)-+ JC L)= A:,. W%*$1. ?(1+&.= ;7B;= === ;]E]t;^7DC
B; QC y8)-3= 9C y(-3= eC $0,= QC e0= #C y(-3= IC y8)-3= eC c(-3=
yC e)-3= yC y8), )-+ GC yC !)-3= T. ?(1+&. 45+2. 4= ;7BE= T=
iDXEPiDi^C
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p!8(2( )2( -, 5,-S'45.* ., +(5')2(qC
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&'()*( +, -,. )+/0*. 1)234-*

&'()*( +, -,. )+/0*. 1)234-*
Journal of Materials Chemistry C
Page 7 of 8
View Article Online
DOI: 10.1039/D0TC04080K
B(8&*13 C1)%
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?C G')T(64540*= 9C !)3)2(= NC #8)68)-= !C #C Q*0(8= NC
f)4+:)-).8)-= NC x243)'(64540* )-+ 9C QC 9,0= X&C. ;6+$1&'*8
;7;7= TR= B7XiDDC
_B "C G)')= MC N4-38= C AC IC J)+)6= 9C ?(= NC &C x0>.)= ?C &C N4-38=
?C IC ?0K(:= 9C QC 9,0= C ?,0)'4 )-+ NC IC &)'= T. ?(1+&. 45+2.
4= ;7;7= ?@"A B7CB7DEF?7!#7;]X_%C
_; "C G)')= eC JC J)-3= NC &C x0>.)= 9C ?(= C AC IC J)+)6= ?C &C N4-38=
?C IC ?0K(:= 9C QC 9,0= C ?,0)'4 )-+ NC IC &)'= T. ?(1+&. 45+2.
4= ;7BE= T= X];_PX]D^C
!84* /,02-)' 4* m !8( ,:)' N,54(.: ,S #8(14*.2: ;7<<
T. B(2+C= ;7BD= DD= BPD l T
&'()*( +, -,. )+/0*. 1)234-*

Journal of Materials Chemistry C
Page 8 of 8
View Article Online
DOI: 10.1039/D0TC04080K
Benzothiadiazole based donor-acceptor emitters with hybrid local and charge transfer state
exhibited high external quantum efficiency in solution-processed green OLEDs.