Key issues and recent progress of high efficient organic light-emitting diodes

TL;DR: The response electron distribution anisotropy approximation (REDA) approximation was proposed to analyze the relationship between optical an isotropy and distribution of bonding electrons in compounds and can be enhanced and excellent nonlinear optical properties can be obtained by optimizing the distribution.

TL;DR: Double-decker platinum complexes with N-heteroaromatic ligands have attracted increasing interest due to their outstanding luminescent properties and rich redox behavior as mentioned in this paper. But their properties are precisely controlled by intra-and intermolecular Pt⋯Pt electronic interactions, and they have been also used to obtain phenomena driven by stimulus-responsive color and luminescence change.

TL;DR: In this article, the authors discussed the recent advances in the OLED materials and the critical tactics employed in designing the anatomy of OLED devices for energy-saving solid-state lighting (SSL) towards lighting revolution.

Abstract: 2D transition metal dichalcogenide (TMD) nanosheets, including MoS2, WS2, and TaS2, are used as hole injection layers (HILs) in organic light‐emitting diodes (OLEDs). MoS2, WS2, and TaS2 nanosheets are prepared using an exfoliation by ultrasonication method. The thicknesses and sizes of the TMD nanosheets are measured to be 3.1–4.3 nm and more than 100 nm, respectively. The work functions of the TMD nanosheets increase from 4.4–4.9 to 4.9–5.1 eV following ultraviolet/ozone (UVO) treatment. The turn‐on voltages at 10 cd m−2 for UVO‐treated TMD‐based devices decrease from 7.3–12.8 to 4.3–4.4 V and maximum luminance efficiencies increase from 5.74–9.04 to 12.01–12.66 cd A−1. In addition, this study confirms that the stabilities of the devices in air can be prolonged by using UVO‐treated TMDs as HILs in OLEDs. These results demonstrate the great potential of liquid‐exfoliated TMD nanosheets for use as HILs in OLEDs.

TL;DR: In this article, the authors demonstrate high-efficiency red electrophosphorescent organic light-emitting devices employing bis(2′-benzo[4,5-a]thienyl)pyridinato-N,C3′) iridium(acetylacetonate) [Btp2Ir(acac)] as a red phosphor.

TL;DR: The search for materials that can replace tin-doped indium oxide as the leading transparent conductive electrode (TCE) has intensified significantly in the past few years, motivated by the ever-increasing price of indium.

TL;DR: In this paper, a white light-emitting electroluminescent devices were fabricated using poly(Nvinylcarbazole) (PVK) as a hole-transporting emitter layer and a double layer of 1,2,4−triazole derivative (TAZ) and tris(8quinolinolato)aluminum(III) complex (Alq) as an electron transport layer.