Blue organic light-emitting diode with a turn-on voltage of 1.47 V

Abstract

Among the three primary colors, blue emission in organic light-emitting diodes (OLEDs) are highly important but very difficult to develop. OLEDs have already been commercialized; however, blue OLEDs have the problem of requiring a high applied voltage due to the high-energy of blue emission. Herein, an ultralow voltage turn-on at 1.47 V for blue emission with a peak wavelength at 462 nm (2.68 eV) is demonstrated in an OLED device with a typical blue-fluorescent emitter that is widely utilized in a commercial display. This OLED reaches 100 cd/m2, which is equivalent to the luminance of a typical commercial display, at 1.97 V. Blue emission from the OLED is achieved by the selective excitation of the low-energy triplet states at a low applied voltage by using the charge transfer (CT) state as a precursor and triplet-triplet annihilation, which forms one emissive singlet from two triplet excitons.

Unlocking Structurally Nontraditional Naphthyridine-Based Electron-Transporting Materials with C–H Activation–Annulation

“…Organic light-emitting diodes (OLEDs) have garnered considerable recognition and acclaim in both academic and industrial circles owing to their remarkable performance across various applications, including flat-panel displays and extensive solid lighting solutions. − Since Tang and his colleagues published pioneering work on OLEDs in 1987, there has been substantial focus on advancing new emitting materials to improve device performance. − In contrast, the progress in developing high-performance transporting materials, specifically electron-transporting materials (ETMs) that significantly impact device performance, has greatly lagged behind. − This limitation can be primarily attributed to the scarcity of efficient core skeletons. Consequently, research on innovative core structures for the development of high-performance ETMs remains a fascinating yet challenging endeavor.…”

Boosting Organic Light-Emitting Diodes Technology Using Thermally Activated Delayed Fluorescent Emitters: A Review

“…It has a close relationship with the energy barrier for electron/hole injection and charge-carrier mobility. 8 The luminous efficiency of a device includes the power efficiency (PE), current efficiency (CE), and quantum efficiency. The PE is the ratio of the luminous flux to the power consumption.…”

“…The turn-on voltage ( V on ) refers to the working voltage of the device when the brightness is 1 cd m –2 . It has a close relationship with the energy barrier for electron/hole injection and charge-carrier mobility . The luminous efficiency of a device includes the power efficiency (PE), current efficiency (CE), and quantum efficiency.…”

Efficient Spin Interconversion by Molecular Conformation Dynamics of a Triplet Pair for Photon Up-Conversion in an Amorphous Solid

“…For example, the up-conversion (UC) technique through the TTA process (TTA-UC) has attracted researchers in several fields related to light-to-energy conversion technologies. In this regard, it is expected that the TTA-UC system contributes not only to commercializing highly efficient OLED devices, − solar cells, − and photocatalysts but also to bringing about innovation in biomedical fields − such as photodynamic therapy, drug delivery systems, optogenetics, and bioimaging …”