Contribution of TADF and exciplex emission for efficient "warm-white" OLEDs

被引：68

作者：

Grybauskaite-Kaminskiene, Gintare ^{[1
]}

Ivaniuk, Khrystyna ^{[2
]}

Bagdziunas, Gintautas ^{[1
]}

Turyk, Pavlo ^{[2
]}

Stakhira, Pavlo ^{[2
]}

Baryshnikov, Gleb ^{[3
,4
]}

Volyniuk, Dmytro ^{[1
]}

Cherpak, Vladyslav ^{[5
]}

Minaev, Boris ^{[3
,4
]}

Hotra, Zenon ^{[2
,6
]}

Agren, Hans ^{[3
,7
]}

Grazulevicius, Juozas Vidas ^{[1
]}

机构：

[1] Kaunas Univ Technol, Dept Polymer Chem & Technol, Radvilenu Plentas 19, LT-50254 Kaunas, Lithuania

[2] Lviv Polytech Natl Univ, S Bandera 12, UA-79013 Lvov, Ukraine

[3] KTH Royal Inst Technol, Sch Biotechnol, Div Theoret Chem & Biol, S-10691 Stockholm, Sweden

[4] Bohdan Khmelnytsky Natl Univ, Shevchenko 81, UA-18031 Cherkassy, Ukraine

[5] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

[6] Rzeszow Univ Technol, W Pola 2, PL-35959 Rzeszow, Poland

[7] Siberian Fed Univ, Inst Nanotechnol Spect & Quantum Chem, Svobodny Pr 79, Krasnoyarsk 660041, Russia

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2018年 / 6卷 / 06期

关键词：

LIGHT-EMITTING-DIODES; ACTIVATED DELAYED FLUORESCENCE; HIGHLY EFFICIENT; HOST MATERIAL; DERIVATIVES; CARBAZOLE; ELECTROLUMINESCENCE; ENHANCEMENT; CONVERSION; MECHANISM;

D O I：

10.1039/c7tc05392d

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The bicarbazole derivative 4,4'-(9H, 9'H-[3,3'-bicarbazole]-9,9'-diyl) bis(3-(trifluoromethyl) benzonitrile), denoted as pCNBCzoCF(3), was synthesized and tested for white OLED applications. pCNBCzoCF3 demonstrated an extremely small value of the singlet-triplet energy gap that caused intensive thermally activated delayed fluorescence (TADF). In addition, this compound is able to form exciplex-type excited states at the interface with star-shaped 4,40,400-tris[phenyl(m-tolyl) amino] triphenylamine (m-MTDATA). Combining the TADF emission of pCNBCzoCF3 with the exciplex emission from the pCNBCzoCF(3) m-MTDATA interface, we fabricated a number of highly efficient "warm-white'' OLEDs, the electroluminescence of which was close to candle emission. The best device demonstrated a very high brightness of 40 900 Cd m(-2) (at 15 V), current efficiency of 53.8 Cd A(-1) and power efficiency of 19.3 lm W-1, while the external quantum efficiency reached 18.8%. The fabricated devices demonstrated high emission characteristics even for the standard test at 1000 Cd m(-2) (current efficiency of 46.2 Cd A(-1), power efficiency of 10.6 lm W-1, EQE of 17.0%).

引用

页码：1543 / 1550

页数：8

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