A Universal Host Material for High External Quantum Efficiency Close to 25% and Long Lifetime in Green Fluorescent and Phosphorescent OLEDs

2014 ◽  
Vol 26 (24) ◽  
pp. 4050-4055 ◽  
Author(s):  
Yong Joo Cho ◽  
Kyoung Soo Yook ◽  
Jun Yeob Lee
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Host Material ◽  
Long Lifetime ◽  
Green Fluorescent

Green fluorescent organic light-emitting device with external quantum efficiency of nearly 10%

2006 ◽  
Vol 89 (6) ◽  
pp. 063504 ◽  
Author(s):  
Kenji Okumoto ◽  
Hiroshi Kanno ◽  
Yuji Hamaa ◽  
Hisakazu Takahashi ◽  
Kenichi Shibata
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting ◽  
Organic Light ◽  
Green Fluorescent

scholarly journals Low efficiency roll-off blue TADF OLEDs employing a novel acridine–pyrimidine based high triplet energy host

2021 ◽  
Author(s):  
Francesco Rodella ◽  
Rishabh Saxena ◽  
Sergey Bagnich ◽  
Dovydas Banevičius ◽  
Gediminas Kreiza ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Host Material ◽  
Triplet Energy ◽  
Low Efficiency

A novel pyrimidine-based host material with a triplet energy of 3.07 eV was synthesized. Sky blue and blue OLEDs were fabricated, obtaining high external quantum efficiency and extremely low efficiency roll-off.

A novel molecular design employing a backbone freezing linker for improved efficiency, sharpened emission and long lifetime in thermally activated delayed fluorescence emitters

2019 ◽  
Vol 7 (10) ◽  
pp. 2919-2926 ◽  
Author(s):  
Ji Gwang Yu ◽  
Si Hyun Han ◽  
Ha Lim Lee ◽  
Wan Pyo Hong ◽  
Jun Yeob Lee
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Molecular Design ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Emission Profile ◽  
Thermally Activated ◽  
Long Lifetime ◽  
Backbone Structure

A novel molecular design employing a backbone structure freezing linker was developed to improve the external quantum efficiency, lifetime and emission profile of thermally activated delayed fluorescence (TADF) emitters.

Synthesis and Electroluminescence Property of Anthracene Green Fluorescent Derivatives Based on Optimized Side Groups

2021 ◽  
Vol 21 (7) ◽  
pp. 4037-4041
Author(s):  
Sangshin Park ◽  
Hyukmin Kwon ◽  
Seokwoo Kang ◽  
Sunwoo Park ◽  
Hyocheol Jung ◽  
...  
Keyword(s):  
Electric Field ◽  
Energy Conversion ◽  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
Molecular Size ◽  
Green Fluorescent ◽  
Fluorescent Derivatives ◽  
Electroluminescence Property

Molecular size of OLED emitting materials is nano-metric size and when it is applied to the electric field it emits the light based on the energy conversion result. As new green fluorescent emitters, N,N,N',N'-Tetra-m-tolyl-anthracene-9,10-diamine (m-Me-TAD) and N,N,N',N'-Tetra-p-tolyl-anthracene-9,10-diamine (p-Me-TAD) were synthesized and the properties were evaluated. In solution state, photoluminescence (PL) maximum wavelength is 517 nm for m-Me-TAD and 529 nm for p-Me-TAD. In electroluminescence (EL) spectra, EL maximum wavelength of m-Me-TAD is 518 nm and p-Me-TAD is 533 nm. The doped device using m-Me-TAD as green fluorescent dopant exhibited current efficiency (CE) of 17.41 cd/A and external quantum efficiency (EQE) of 7.41%. The doped device with p-Me-TAD was optimized in order to achieve a green OLED with high efficiency.

High Efficiency Green Fluorescent Dopant Through the Optimized Side Group for Organic Light Emitting Diodes

2021 ◽  
Vol 21 (7) ◽  
pp. 4000-4004
Author(s):  
Hyukmin Kwon ◽  
Seokwoo Kang ◽  
Sangshin Park ◽  
Sunwoo Park ◽  
Seungeun Lee ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
Green Light ◽  
Molecular Size ◽  
Electrical Energy ◽  
Light Emitting ◽  
Tert Butyl ◽  
Green Fluorescent

OLED light emitting materials have a molecular size corresponding to the nano scale and are converted into light energy when given electrical energy. The new green fluorescent dopant material was successfully synthesized by using anthracene as a central core and introducing a methyl group and tert-butyl group at various positions as diphenylamine group. Two compounds are N9,N9,N10,N10-tetraphenylanthracene-9,10-diamine (TAD) and N9,N10-bis(4-(tert-butyl) phenyl)-N9,N10-di-o-tolylanthracene-9,10-diamine (p-Tb-o-Me-TAD). The synthesized material emits green light with the maximum wavelengths of 508 and 523 nm. p-Tb-o-Me-TAD shows excellent PLQY of 86.2% in solution state. When the synthesized material was used as a dopant in a device, TAD showed current efficiency (CE) of 17.71 cd/A and external quantum efficiency (EQE) of 6.11%. The device using p-Tb-o-Me-TAD dopant exhibited current efficiency (CE) of 24.24 cd/A and external quantum efficiency (EQE) of 7.27%.

Erratum: “Green fluorescent organic light-emitting device with external quantum efficiency of nearly 10%” [Appl. Phys. Lett. 89, 063504 (2006)]

2006 ◽  
Vol 89 (16) ◽  
pp. 169901
Author(s):  
Kenji Okumoto ◽  
Hiroshi Kanno ◽  
Yuji Hamada ◽  
Hisakazu Takahashi ◽  
Kenichi Shibata
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting ◽  
Organic Light ◽  
Green Fluorescent

An excellent bipolar host material exhibiting EQE of 24.0% with small efficiency roll-off in solution-processable thermally activated delayed fluorescence OLEDs

2019 ◽  
Vol 7 (44) ◽  
pp. 13930-13938 ◽  
Author(s):  
Mallesham Godumala ◽  
Jiwon Yoon ◽  
Cheol Hun Jeong ◽  
Chiho Lee ◽  
Ji-Eun Jeong ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Organic Material ◽  
External Quantum Efficiency ◽  
Delayed Fluorescence ◽  
Host Material ◽  
High Brightness ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Solution Processable

The D–A–D′-type novel organic material APC was designed and synthesized as a host for TADF emitters. APC realized an external quantum efficiency of 24.0% and also retained 23.1 and 21.7% at high brightness of 500 and 1000 cd m−2, respectively.

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