Thermally activated delayed fluorescence blue dopants and hosts: from the design strategy to organic light-emitting diode applications

Mallesham Godumala, Suna Choi, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalReview article

82 Citations (Scopus)

Abstract

Thermally activated delayed fluorescence (TADF) materials have attracted much attention in the field of organic light-emitting diodes (OLEDs), with their state-of-the-art performance in terms of external quantum efficiencies (EQEs), turn-on voltages, and color coordinates. TADF materials exhibited EQEs above 25% due to harvesting both singlet and triplet excitons via reverse intersystem crossing (RISC). A small singlet-triplet energy gap (ΔEST) is essential for TADF materials to exhibit efficient upconversion from the lowest triplet excited state (T1) to the lowest singlet excited state (S1, T1 → S1). Moreover, these materials are purely organic and thus not costly. Therefore, the TADF approach provides the best alternative to conventional fluorescent and phosphorescent OLEDs, regarding device efficiency and cost. On the other hand, blue light-emitting devices are facing several issues related to their stability and efficiency, making their development quite challenging for researchers. Herein, we review the recent advances in the use of blue TADF dopants and hosts in OLEDs.

Original languageEnglish
Pages (from-to)11355-11381
Number of pages27
JournalJournal of Materials Chemistry C
Volume4
Issue number48
DOIs
Publication statusPublished - 2016

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Organic light emitting diodes (OLED)
Fluorescence
Doping (additives)
Quantum efficiency
Excited states
Excitons
Energy gap
Color
Electric potential
Costs

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

Thermally activated delayed fluorescence blue dopants and hosts : from the design strategy to organic light-emitting diode applications. / Godumala, Mallesham; Choi, Suna; Cho, Min Ju; Choi, Dong Hoon.

In: Journal of Materials Chemistry C, Vol. 4, No. 48, 2016, p. 11355-11381.

Research output: Contribution to journalReview article

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abstract = "Thermally activated delayed fluorescence (TADF) materials have attracted much attention in the field of organic light-emitting diodes (OLEDs), with their state-of-the-art performance in terms of external quantum efficiencies (EQEs), turn-on voltages, and color coordinates. TADF materials exhibited EQEs above 25{\%} due to harvesting both singlet and triplet excitons via reverse intersystem crossing (RISC). A small singlet-triplet energy gap (ΔEST) is essential for TADF materials to exhibit efficient upconversion from the lowest triplet excited state (T1) to the lowest singlet excited state (S1, T1 → S1). Moreover, these materials are purely organic and thus not costly. Therefore, the TADF approach provides the best alternative to conventional fluorescent and phosphorescent OLEDs, regarding device efficiency and cost. On the other hand, blue light-emitting devices are facing several issues related to their stability and efficiency, making their development quite challenging for researchers. Herein, we review the recent advances in the use of blue TADF dopants and hosts in OLEDs.",
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