High efficiency and low efficiency roll-off hole-transporting layer-free solution-processed fluorescent NIR-OLEDs based on oligothiophene-benzothiadiazole derivatives

Article abstract of DOI:10.1039/d0tc00450b

We report on simple low band-gap D-A-D type chromophores comprising triphylamine as a donor and oligothiophene-benzothiadiazoles as an acceptor. In the solid state, they exhibited strong near-infrared (NIR) emission with high fluorescence quantum yield wh

Full text of DOI:10.1039/d0tc00450b

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Journal of
Materials Chemistry C
Materials for optical, magnetic and electronic devices
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Chasing, T. Kaewpuang, T. Manyum, C. Chaiwai, S. Namuangruk and V. Promarak, J. Mater. Chem. C,
2020, DOI: 10.1039/D0TC00450B.
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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
Page 4 of 7
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DOI: 10.1039/D0TC00450B
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Journal of Materials Chemistry C
Page 5 of 7
View Article Online
DOI: 10.1039/D0TC00450B
C,3.')+ 4)D$
A6>5B89
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6)5001 ., R,21 )- )5.46( +4,+( )2() ,R Y 11;C #022(-. +(-*4.:Q XS= YXU= ;C]E T.= L P ]C^ XS= YXU= ;CZ[ T.= L P ]C^ XS= YXU= BC]Y T.= L
6,'.)3(Q2)+4)-5( TLN7N<U 58)2)5.(24*.45* G(2( 1()*02(+ P ]C; XS= YXU= BCZE T.= L P ]C^ XS= YXU= BCZD T.= L P ]C^ XS= YXU=
*410'.)-(,0* 0*4-3 ) J(4.8'(: ;Y77 *,025( 1(.(2 )-+ ) BCYZQBCY7 T1= ^XU= BCDDQBC;D T1= D7XU= BCZ;QBCZ7 T;C^Z T.= L P ZCZ
X)1)1).*0 &8,.,-45* &LAQB; 10'.4Q58)--(' )-)':S(2C !8( XS= B^XUy BD#QML TB[7 LXS= #?#'DU p B[BC[^= BYZC^Z= BYZC[Y=
)K*,'0.( (<.(2-)' V0)-.01 (RR454(-5: T%_%U ,R @$%? +(645(* BYZCBB= BDECD]= BD^C[[= BD]CZ;= BDZC^[= BD[CZ;= BD;CY[= BD;C;E=
G)* ,K.)4-(+ K: X)1)1).*0 &8,.,-45* #EE;7QB; %<.(2-)' BDBCZB= BD7CD;= B;EC][= B;^C^B= B;^CDB= B;^CB]= B;]C^Y= B;]C;E=
_0)-.01 %RR454(-5: L()*02(1(-. I:*.(1 0.4'4S4-3 )- B;]CBB= B;YCY7= B;YCB[= B;DCZZ= B;DCB[= B;;CBY= B;;C7^= B;BCZY=
4-.(32).4-3 *>8(2(C A'' .8( 1()*02(1(-.* G(2( >(2R,21(+ D7C]7= D7CZ[= ;ECEB= ;EC[Z= ;EC[Y= ;^CZ^= ;^CYY= ;^CDB= ;^C;^=
0-+(2 )1K4(-. ).1,*>8(2( ). 2,,1 .(1>(2).02(C
;^CB^= ;]C^;= ;BCZ[= ;BCZD= ;BCZ7= BDCBB= BDC7E >>1y X LI
X,'( ,-': +(645( G4.8 5,-R4302).4,- ,R "!@F&%?@!A&IIF>?0<@/A TLA$?"Q!@\UA 5')5+C R,2 #B7;XBBYMYI] TLsUA BZBEC]B;;= R,0-+A
TB]7-1UFL,@DFA' G)* )'*, R)K245).(+C
BZBECEB;ZC
! "#$%"!%"""#$&'()*+,-+.!/!%-0123423)*5'# !6#42758&29$:"! #
421';75#+/!/"#&2012*<1'('-#%"!%#427588&29$=!=#42<1'(753(252('8
B,'&+31!,'1
$>?0).8@
A
14<.02( ,R Y=]QK4*TD=YvQ+48(<:'Q[vQ4,+,Qg;=;vQ
"- *011)2:= -(G R'0,2(*5(-. M" (14..(2* 5,1>24*4-3 ,R
.24>8(-:')14-( )* .(214-)' +,-,2 )-+ ,'43,.84,>8(-(Q
K(-S,.84)+4)S,'( )* )55(>.,2 5,2( 8)6( K((- >2(>)2(+C !8(:
(<84K4. 8438 V0)'4.: *>4-Q5,).(+ *,'4+ R4'1* G4.8 M" (14**4,-
)-+ 8438 \* G8(- +,>(+ 4- #W& 8,*.= )-+ 8)6( )>>2,>24).(
X@L@ '(6('* T[C7[Q[C;7 (NUC I058 )**(.* 1)H( .8(1 *04.)K'( R,2
',GQ5,*.= *41>'( X!$QR2(( *,'0.4,-Q>2,5(**(+ M" Q@$%?*C !8(
,>.414S(+ +,0K'( '):(2 @$%?* (<84K4.(+ ) *.2,-3 (14**4,- 4-
M" 2)-3( T]7;Q];D -1U G4.8 ) 8438 1)<4101 %_% ,R BC[;`=
',G N,- ,R [CB N )-+ *'438. (RR454(-5: 2,''Q,RRC !, .8( K(*. ,R ,02
H-,G'(+3(= .84* 2(*0'. 2(>2(*(-.* .8( 5022(-. *.).( ,R .8( )2. R,2
R'0,2(*5(-. *,'0.4,-Q>2,5(**(+ M" Q@$%?C
K4.84,>8(-hQ[Q:'UK(-S,g5hgB=;=[h.84)+4)S,'( TJU T7C[E 3= 7C[Z
11,'U= TYQT+4>8(-:')14-,U>8(-:'UK,2,-45 )54+ T7CDY 3= BCB^
11,'U= &+T&&8DUY T7C7D 3= 7C7D 11,'U )-+ ; L M);#@D TB[ 1$U
4- !X\ TD7 1$U G)* +(3)**(+ G4.8 M; R,2 B7 14-C !8( 14<.02(
G)* *.422(+ ). 2(R'0< 0-+(2 M; R,2 ;Y 8C AR.(2 5,,'4-3= G).(2 T[7
1$U G)* )++(+= )-+ .8( 14<.02( G)* (<.2)5.(+ G4.8 #X;#'; TD <
[7 1$UC !8( 5,1K4-(+ ,23)-45 >8)*( G)* G)*8(+ G4.8 G).(2
T[7 1$U= K24-( *,'0.4,- T[7 1$U= +24(+ G4.8 )-8:+2,0* M);I@Y
)-+ R4'.(2(+C !8( *,'6(-. G)* 2(1,6(+ ., +2:-(** )-+ .8( 520+(
>2,+05. G)* >024R4(+ K: 5,'01- 582,1).,32)>8: ,- *4'45) 3('
('0.4-3 G4.8 ) 14<.02( ,R #X;#';F8(<)-( ., :4('+ +)2H 2(+ *,'4+*
,
B
T7CY7 3= [Z`Uy 1C>C BEBQBE; #y XQML T[77 LXS= #?#'DU p
^C7B T*= ;XU= ]C^[ T*= ;XU= ]CY] T+= L P ^C[ XS= YXU= ]CD] T+= L P ^C[
XS= ;XU= ]CDDQ]C;] T1= ;7XU= ]CBEQ]CBD T1= ;ZXU= ]CB7Q]C7D T1=
B7XU ;CEB T.= L P ]C[ XS= YXU= ;C]DQ;C]7 T.= L P ]C[ XS= YXU= BC^;Q
BC]Z T1= YXU= BC]BQBCZ] T1= YXU= BCYE T*= YXU= BCD^QBC;^ T1= ;^XU=
7CE; T.= 9 p [C[ XS= BYXUy BD#QML TB;[ LXS= #?#'DU p B[;CZ;=
BY]C]Y= BY]C[[= BY]CB[= BYZC][= BY7CBD= BD^C];= BDZCYY= BDYC]Z=
BDDCYE= BD;CEY= BD7C]Z= B;EC^Y= B;ED[= B;EC;Z= B;^C[Y= B;^C7^=
B;]CDB= B;[CYY= B;[CB]= B;YC]B= B;YC[Z= B;YCD;= B;YCB7= B;DCBE=
B;DC7E= B;;C^D= DBC][= DBC]7= D7CE^= D7CZY= ;ECZ^= ;ECD]= ;EC;Y=
;^C^]= ;;CZE= ;;CZ[= BYCBY >>1y X LI TLA$?"Q!@\UA 5')5+C R,2
#^;X^ZMYI[ TLsUA B;^ZC[Y[Z= R,0-+A B;^ZCDY]EC
B,'%+!&01 ,% !'0$.$10
!8(2( )2( -, 5,-R'45.* ., +(5')2(C
A&N',-+$*"$D$'01
!84* G,2H G)* R4-)-54)'': *0>>,2.(+ K: .8( ! \ T !AZ7^777[U
)-+ .8( MAM@!%#= MI!?A= L4-4*.2: ,R I54(-5( )-+ !(58-,',3:=
!8)4')-+= .82,038 4.* >2,32)1 ,R (*()258 M(.G,2H MAM@!%#C
!8)-H* )'*, 3, ., N"I!%# R,2 .8( *0>>,2. ,R K,.8 &,*.+,5.,2)'
\('',G*84> T., !C ICU )-+ (V04>1(-.C
! "#$%""!%"""""#$&'()*+,-+.!/!%-0123423)*5'# !6#42758&29$:"!:""! #
0A21';75#+/!/"@%"!/""#0'A012*<1'('-#%""!%#427588&29$=!=#
4,0$1 )'* .$%$.$'&$1
42<1'(753(252('8 $>?0)/8@ A 14<.02( ,R Y=]QK4*TD=Yv=YvvQ.248(<:'Q
[vvQ4,+,Qg;=;vA[v=;vvQ.(2.84,>8(-hQ[Q:'UK(-S,g5hgB=;=[h.84)+4)S,'(
TMU T7CB; 3= 7C7E 11,'U= TYQT+4>8(-:')14-,U>8(-:'UK,2,-45 )54+
T7C7Z 3= 7CB^ 11,'U= &+T&&8DUY T7C7B 3= 7C7B 11,'U )-+ ; L
M);#@D TB[ 1$U 4- !X\ TD7 1$U G)* +(3)**(+ G4.8 M; R,2 B7 14-C
!8( 14<.02( G)* *.422(+ ). 2(R'0< 0-+(2 M; R,2 ;Y 8C AR.(2
5,,'4-3= G).(2 T[7 1$U G)* )++(+= )-+ .8( 14<.02( G)*
B
T)U LC &R(4RR(2= IC C \,22(*.= JC $(,= LC %C !8,1>*,-= A1 M
-"$#*M= ;77;= @I= BZDDy TKU XC l,:)1)= JC c,0*84= JC I84S0= XC
M,102) )-+ #C A+)584= D"$6*#= ;7B;= IOA= ;DYy 5U &C
L,,-*4-= MC &2)58012)H= IC M)10)-320H= IC 90-3*0..4G,-3=
!C J()G4-= !C I0+:,)+*0H )-+ NC &2,1)2)H= LM -"$#*M B5#+M
B= ;7BY= A= [[Y7C
!84* /,02-)' 4* j !8( ,:)' I,54(.: ,R #8(14*.2: ;7<<
LM D"+#C= ;7BD= EE= BQD i J
&'()*( +, -,. )+/0*. 1)234-*

&'()*( +, -,. )+/0*. 1)234-*
Journal of Materials Chemistry C
Page 6 of 7
View Article Online
DOI: 10.1039/D0TC00450B
A6>5B89
C,3.')+ 4)D$
;
T)U AC LC I14.8= LC #C L)-54-4 )-+ IC M4(= D"$M D"&'$#05&'%M=
;B T)U 9C ,-5)'4= -"0*'+'%M <")!1 B'++6&M= ;77]= AQ= B]ZBy TKU
BY !C J()G4-= #C I,,H*)4= MC &2)58012)H= !C J)(G>0)-3= ?C
L0(-1)2.= IC M)10)-320H= IC 90-3*0..4G,-3= !C I0+:,)+*0H
)-+ NC &2,1)2)H= </B A1 M= ;7B[= J= BZY;;C
;; )U AC !8)-3.8,-3= ?C L(0-1)2.= MC &2)58012)H= IC
90-3*0..4G,-3= !C J()G4-= !C I0+:,)+*0H )-+ NC &2,1)2)H=
B5#+M B'++6&M= ;7BB= IM= ]B;;y KU !C J8)-)*)= MC
&2)58012)H= C )..)-)G)-= IC 90-3*0..4G,-3= !C J()G4-= !C
I0+:,)+*0H= !C !0-.0')-4 )-+ NC &2,1)2)H= LM H*3M B5#+M=
;7BD= MQ= Z]7;C
;D T)U eC ?(-3= PC e0)-= zC 94) )-+ cC $40= LM J58.M B5#+M U= ;7BY=
@@Q= BY[DZy TKU MC 9C X(*.)-+ )-+ \C #C I>)-,= B5#+M <# M=
;7B^= @@Q= ]7ZEC
;Y 9C NC #)*>)2= %C LC J,K(2= WC &C I0''46)- )-+ !C 9C L(:(2= LM A+M
B5#+M /'0M= BE^;= @EI= ZD7C
;77E= I= ]B7y &C AC X)438= \C W)0*4= zC c8)**(1',,:= "C
&)>)H,-*.)-.4-,0= XC $( L4-8= #C \'(58,- )-+ \C #)54)''4= H)$M
2Q)*#..= ;7BY= AA= ;^D7y TKU ?C !*,-(6= IC N4+(6 )-+ XC X))*=
J*'0M /J92= ;7BY= OEEM= E77]7;y T5U MC !(**'(2= NC L(+6(+(6=
LC J)S(*= IC J)- )-+ lC W)-4-= /0!#&0#= ;77;= AOJ= B[7ZC
T)U AC z)1>(..4= AC L4-,.., )-+ \C #)54)''4= A1 M R6&0$M -"$#*M=
;7BE= AO= B^7]Z;Dy TKU eCQ#C $,= !CQXC e(8= #CQJC P)-3= WCQ9C
&(-3= 9CQ$C X*4(8= #CQ#C $((= ICQPC $40 )-+ JCQ!C P,-3= AB/
A))%M -"$#*M 9&$#*,"0#.= ;7BE= @@= ;DYB]C
T)U LC NC A0G(2)(2= zC C c2)K,G*H4 )-+ PC (..43= LM J58.M
B5#+M= BEEB= OJ= ;7^Dy TKU C %-3'1)- )-+ 9C 9,2.-(2= -'%M
J58.M= BE]7= @Q= BY[y T5U C \020(= JC L).*0,= eC A*84H)24= XC
@,H)= MC A1)-,H02) )-+ !C e)*0+)= A1 M H)$M -"$#*M= ;7B^=
P= B]7BBY]C
D
Y
[
Z
T)U JC I0-= ?C #80= eC #04= PC !4)-= eC I0- )-+ PC 94)-3= H*3M
2%#0$*'&M= ;7B]= IQ= D^Ey TKU cC _4)- )-+ zC eC P)-3= B5#+MS
A.!"& LM= ;7B7= J= B77Zy T5U WC I.(-+(2= IC \C N{'H(2= #C $)1K(2. ;Z AC !8)-3.8,-3= MC &2)58012)H= IC M)10)-320H= IC
;[ ?C z8)-3= $C ?0)-= ?C z8)-3 )-+ eC _40= LM -"$#*M B5#+M B=
;7BY= A= ^E^DC
)-+ 9C &R')01= A1 M -"$#*M= ;7BD= AJ= ;EYDy T+U |C ?0= 9C _4= zC
z8)-3= ?C L) )-+ zC eC P)-3= B5#+M -"$#*M= ;7B;= AI= ;B]^C
T)U LC #,5584= ?C N4234'4= NC \)..,24= 9C P4''4)1* )-+ 9C
90-3*0..4G,-3= !C J()G4-= !C I0+:,)+*0H )-+ NC &2,1)2)H=
26*M LM H*3M B5#+M= ;7B;= [;ZDC
;] AC !8)-3.8,-3= MC &2)58012)H= IC I)(-3*0G)-= IC
M)10)-320H= !C J()G4-= IC 90-3*0..4G,-3= !C I0+:,)+*0H
)-+ NC &2,1)2)H= LM -"$#*M B5#+M B= ;7B[= H= D7^BC
;^ LC I8414S0= C J)H4= eC !)H(+)= !C X4:)1)= MC M)3)4= XC
e)1)34*84 )-+ XC \020.)-4= A&3#KM B5#+M 9&$M 21M= ;7B;= J@=
Y7E[C
J)'4-,G*H4= A))%M J58.M T#$$M= ;77]= OE= 7;D[7Zy TKU $C X0)-3=
#C &)2H= !C \'((.8)1 )-+ 9C $4= A))%M J58.M T#$$M= ;7BZ= @EO=
;DDD7;y T5U IC J(*)2H)2= PC L2}S= LC &(-5,-4= LC &)*4-4= IC
?(*.24= LC #)SS)-43)= ?C #(2(*,'4= &C C L0**4-4= #C W)'+,'4= lC
c4,6)-('') )-+ AC W,**4= A&3#KM B5#+M 9&$M 21M= ;7BZ= JJ=
;]BYy T+U |C #),= 9C L4),= LC z80= #C z8,-3= #C e)-3= XC P0= 9C ;E T)U IC P(821(4*.(2= $C 9Å3(2= !C P(8'0*= AC \C )0*58= !C #CÇcC
_4- )-+ eC #),= B5#+M -"$#*M= ;7B[= AM= EZC
9C |0(= #C $4= $C |4-= $C ?0)- )-+ 9C _4),= B5#+M /0!M= ;7BZ= M=
;^^^C
$C e),= IC z8)-3= C P)-3= PC $4= \C I8(-= WC e)-3 )-+ eC L)=
A&3#KM B5#+M= ;7BY= @AP= ;B[BC
(0*58= !C ?C I5814+. )-+ PC W2u..4-3= J58.M <# M A))%!#1=
;7B[= H= 7;Y77^y TKU $C z8)-3= zCQ&C e)- )-+ eCQ|C z8(-3=
("%$'& :*"&.M= ;7BE= IQ= E]YYC
]
^
E
D7 IC !C $(= !C J)-(*)-= \C W)0*4= &C AC X)438= IC )/K8)-+)24= zC
c8)**(1',,:= "C &)>)H,-*.)-.4-,0= PC @C &,>,,')= AC
W02.,-= XC $( L4-8= \C #)54)''4 )-+ AC ?C %''4*= H)$M T#$$M= ;7BY=
HO= D^]ZC
T)U IC P)-3= |C e)-= zC #8(-3= XC z8)-3= eC $40 )-+ eC P)-3=
A&3#KM B5#+M4 9&$M 21M= ;7B[= JI= BD7Z^y TKU eC e0)-= eC X0=
eCQ|C z8)-3= 9CQ?C $4-= eCQJC P)-3= zCQ_C 94)-3= $CQIC $4), )-+ ICQ DB LC 9C \24*58= cC PC !205H*= XC WC I58'(3('= cC %C I50*(24)= LC AC
!C $((= A1 M R6&0$M -"$#*M= ;7B]= AM= B]77E^Zy T5U XC \C
X4334-K,.8)1= &C &)-+(2= C :K)H4(G45S= LC JC %.8(24-3.,-=
IC L)-4)1= LC z)3,2*H)= AC &2,-= AC &C L,-H1)- )-+ &C
?).)= LM -"$#*M B5#+M B= ;7B^= P= ^;BEC
,KK= 9C C #8((*(1)-= cC I5)'1)-4= NC W)2,-(= WC L(--0554=
cC AC &(.(2**,-= XC M)H).*0/4= LC #)245).,= |C $4= XC &C
X2).584)-= AC \C "S1):',6= 9C W',4-,= cC z8(-3= 9C $C
I,--(-K(23= LC X)+)= LC %8)2)= JC !,:,.)= C \0H0+)= 9C
X)*(3)G)= LC "*84+)= !C M)H)/41)= eC X,-+)= @C J4.),= XC
M)H)4= !C N2(6(-= 9C AC L,-.3,1(2:= 92C= 9C %C &(2)'.)= \C
@3'4)2,= LC W()2>)2H= 9C 9C X(:+= %C W2,.8(2*= JC MC J0+4-= NC
MC I.)2,6(2,6= C J,K):)*84= 9C M,21)-+= JC )38)6)58)24= AC
(-+(''= 9C #C W02)-.= IC IC ":(-3)2= 9C !,1)*4= LC #,**4= MC
(3)= 9C LC L4'')1= LC J'(-(= 9C %C J-,<= 9C WC #2,**= NC
W)HH(-= #C A+)1,= 9C 9)2)14'',= C c,1>(2.*= C %C I.2).1)--=
@C e)S:(6= AC 9C A0*.4-= C #)114= #C &,1(''4= 9C PC @58.(2*H4=
C $C L)2.4-= JC L,2,H01)= NC cC z)H2S(G*H4= cC AC N,.8= &C
I)'6)+,2= 9C 9C ?)--(-K(23= IC ?)>>2458= AC ?C ?)-4('*= ÉC
\)2H)*= 9C WC \,2(*1)-= 9C NC @2.4S= 9C #4,*',G*H4 )-+ ?C 9C \,<=
V"6..!"& ?W Tc)0**4)-= "-5C= P)''4-3R,2+ #!= ;77EUC
B7 XC e(= ?CQXC J41= |C #8(-= AC IC ?C I)-+)-):)H)= 9CQlC J41= %C
z)K,2,6)= cC #)-)2+= eC !*0584:)= %CQeC #8,4= 9CQPC P0=
\)3(*=\Cy 9CQ$C W2(+)*= AC ?~A'( ,= 9CQ#C 4K4(22( )-+ #C A+)584=
B5#+M -"$#*M= ;7B^= HE= Z]7;C
BB !C $40= $C z80= #C z8,-3= cC |4(= IC c,-3= 9C \)-3= ?C L) )-+ #C
e)-3= A1 M R6&0$M -"$#*M= ;7B]= AM= BZ7ZD^YC
B; &C ?).)= &C &)-+(2= LC @H)S)H4= eC !)H(+)= IC L4-)H).) )-+ AC
&C L,-H1)-= A&3#KM B5#+M 9&$M 21M= ;7BZ= JJ= []DEC
BD #C $4= C ?0)-= WC $4)-3= cC X)-= IC P)-3= JC e(= eC $40= eC e4
)-+ eC P)-3= A&3#KM B5#+M 9&$M 21M= ;7B]= JP= BB[;[C
BY ?C XC J41= AC ?~A'Ä,= |C JC #8(-= AC ?C IC I)-+)-):)H)= ?C e),=
$C z8),= !C J,14-,= %C z)K,2,6)= cC #)-)2+= eC !*0584:)= %C
#8,4= 9C PC P0= \C \)3(*= 9C $C W2Ä+)*= 9C #C 4K4(22( )-+ #C
A+)584= D"$M J5'$'&!0.= ;7B^= @A= E^C
B[ LC z8)-3= IC |0(= PC ?,-3= _C P)-3= !C \(4= #C c0 )-+ eC L)=
B5#+M B'++6&M= ;7B7= IP= DE;DC
BZ AC z)1>(..4= AC L4-,..,= WC L)24) IV0(,= NC cC c2(3,24,0= IC
A'')2+= lC I58(2R= #C $C #8,58,* )-+ \C #)54)''4= /0!M <#)M= ;7B]=
M= BZBBC
B] %C z:*1)-Q#,'1)-= IC IC c8,*8= cC |4(= IC N)238(*(= LC
#8,G+802:= MC I8)21)= ?C WC #,2+(*= AC LC zC I')G4- )-+ "C ?C
PC I)10('= AB/ A))%M -"$#*M 9&$#*,"0#.= ;7BZ= Q= E;Y]C
B^ 9C |0= \C &(-3= zC I0-= $C e0= PC e)-3 )-+ eC #),= LM -"$#*M
B5#+M B= ;7BE= M= B;BBYC
BE AC L4-,..,= &C L02.,= zC c(-(-(= AC z)1>(..4= cC #)2-45('')=
PC L)11,= LC C A-+(2**,-= %C P)-3 )-+ \C #)54)''4= A1 M
-"$#*M= ;7B^= HE= B]7Z[^YC
;7 cC _4)- )-+ zC e0)- P)-3= B5#+M A.!"& LM= ;7B7= J= B77ZC
P i LM D"+#C= ;7B;= EE= BQD
!84* /,02-)' 4* j !8( ,:)' I,54(.: ,R #8(14*.2: ;7<<
&'()*( +, -,. )+/0*. 1)234-*

Page 7 of 7
Journal of Materials Chemistry C
View Article Online
DOI: 10.1039/D0TC00450B
Graphical Abstract
High efficiency and low efficiency roll-off hole-transporting layer-free solution-processed
fluorescent NIR-OLEDs based on oligothiophene-benzothiadiazole derivatives
Taweesak Sudyoadsuk,a Pongsakorn Chasing,a Terdkait Kaewpuang,ab Thanaporn Manyum,b
Chaiyon Chaiwai,a Supawadee Namuangrukc and Vinich Promarak*ad
We reported on simple low band-gap D-A-D type chromophores comprising of triphylamine as a
donor and oligothiophene-benzothiadiazoles as accceptor. In solid state, they exhibited a strong
near-infrared (NIR) emission with high fluorecence quantum yield when doped in CBP host and
low lying HOMO levels suitiable as hole-transporting NIR fluorescent emitter for organic light-
emitting diodes (OLEDs). Simple hole-transporting free solution-processed double-layer OLEDs
(ITO/PEDOT:PSS (40nm)/EML (60 nm)/TPBi (35 nm)/LiF (0.5 nm):Al (150 nm)) demonstrated
NIR emission (702-758 nm) with an excellent maximum EQE of 1.52%, low efficiency roll-off and
high maximum radiance of 4463 mW Sr−1 m−2, which is amongst the best performance for NIR-
OLEDs based on organic fluorescent materials.
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