33‐3: TADF Emitter Selection for Deep‐Blue Hyper‐Fluorescent OLEDs

Abstract

Blue fluorescent OLEDs are still the bottleneck for the power consumption in today´s OLED panels. In recent years, the TADF technology has shown fast progress towards high-efficiency deepblue emitter systems. The TADF technology can be used in a selfemitting or in a co-emitting (or hyper) approach. To make the coemitting system work efficiently, the combination of TADF and fluorescent emitter has to be chosen carefully. In this paper, we will discuss how to match TADF and fluorescent emitter combinations for the co-emitting approach. We will also show results for highly efficient deep-blue hyper-fluorescent devices.

Hyperfluorescence-Based Emission in Purely Organic Materials: Suppression of Energy-Loss Mechanisms via Alignment of Triplet Excited States

“…In this approach, TADF sensitizers and fluorescent emitters are embedded as dopants in a host matrix, so that Förster resonance energy transfer (FRET) can occur from the S 1 TADF state of a TADF molecule to the S 1 FE state of a fluorescent emitter. Because of the high radiative decay rates and narrow emission spectra of the latter, fast and complete FRET increases not only the OLED stability but also its color purity. − …”

13‐3: Improvement of Blue Pixels in OLED Panels with more Efficient Fluorescent and TADF Emitters

“…We have previously shown that by choosing a matched combination of TADF emitter and a fluorescent acceptor, very high Förster radii even in deep-blue can be achieved. [7] For example, the system shown in Figure 3 using a CYNORA TADF emitter has a Förster radius of 3.6 nm and a blue hyperfluorescence emission with CIEy = 0.17.…”

High-Efficiency Functional Materials: Challenges and Developments in Solution and Dry Processed Green OLEDs

“…OLED displays have some interesting features that endow them with amazing features over other established technologies, such as LCDs. [1][2][3][4] As compared to LCDs, OLEDs do not possess a backlight system. However, they possess some interesting features such as enhanced resolution, high contrast ratio, transparent displays, wider viewing angles, and faster response time.…”

“…However, they possess some interesting features such as enhanced resolution, high contrast ratio, transparent displays, wider viewing angles, and faster response time. [1][2][3][4] The most important feature is the flexibility of these displays, which can be twisted and rolled up similar to a poster, opening new doors to the practical applications of these displays. However, OLEDs still have some issues with regards to their material development and device architecture.…”

“…Also, there is a strong need to focus more on the design and development of efficient OLED materials and then their involvement in the construction of flexible OLEDs because it is an open contest as such devices experience glitches associated with the thermal and chemical stability of flexible substrates. 4 In a typical OLED structure, organic film semiconductors with a thickness of a few nanometres are sandwiched between the two electrodes, i.e., cathode and anode (Fig. 1).…”