24.4: A Linear High‐T_g Arylphosphine Oxide‐Triazine Conjugate as a Doped Electron‐Transport Material for Stable Phosphorescent OLEDs

Abstract

Organic electron‐transport materials (ETMs) play a critical role in enhancing performances and operational stability of organic light‐emitting diodes. In this context, we describe a triazine‐based electron‐transport material in high purity 6‐dphenylphosphinyl‐6′‐(4,6‐(tiphenyl‐1,3,5‐triazin‐2‐yl)[2,2′‐binaphthyl] (DPO‐2Na‐TRZ, MW= 685.75) via arylphosphine oxide modification. It exhibits a glass transition temperature of 130.8 °C. HOMO = −6.03 eV, LUMO = −3.08 eV. Its decomposition occurs at ca. 456 °C at 1% weight loss. Upon 50 wt% Liq doping, DPO‐2Na‐TRZ is investigated as an electron transport layer in bottom‐ and top‐emission green phosphorescent OLEDs. In the presence of an additional exciton‐blocking/electron‐transport layer, the resulting topemission OLED provides attractive characteristics. At a luminance of ca 1000 cd m−2, LE = 91.6 cd A−1, PE = 102.8 lm W−1 and EQE = 22.1 %. Moreover, under continuous driven at a constant current, an extraordinary lifetime t99 > 600 h @ 1000 cd m−2 is observed.

37‐4: A phenanthroline derivative modified by arylphosphine oxide moiety as nCGL in tandem OLEDs

“…B: ITO/ HIL / HTL / EB1 / EMB / ETL / nCGL / pCGL / HTL / EB2 / EMB / ETL / EIL / Mg: Ag G: ITO/ HIL / HTL / EB1 / EMG / ETL / nCGL / pCGL / HTL / EB2 / EMG / ETL / EIL / Mg: Ag Relative to the reference tandem OLEDs, it is worth pointing out that the current efficiency and working voltage of tandem blue fluorescent (B) and green phosphorescent (G) OLEDs involving doped pPhen-NaDPO as nCGL were comparable or slightly improved (Table 5). Moreover, we observed significant enhancement by 8-13% in device stability LT95 [13][14][15][16] .…”

Nanostructures for In Situ SERS Analysis of High-Temperature Processes

“…In situ high-temperature SERS can monitor the phase development of crystals during heat treatment with enhanced sensitivity, which could provide abundant information for the study of the thermal crystallization. Tri (8-hydroxyquinoline) aluminum (Alq3) film is one of the most widely used electron transfer and emission materials for organic photodiodes (OLEDs) [58]. However, the crystallization of Alq3 film and the increase in surface roughness leads to the degradation of OLED [59].…”

4.2: A 9‐(4‐diphenylphosphinylphenyl)anthracene derivative as a blue emitter host and a hole‐blocking layer in Deep Blue OLEDs

“…It exhibits deep HOMO/LUMO levels of -5.98/-3.09 eV with a Tg of 128°C. The deep blue OLED that utilized m-TPO-An-BP as the holeblocking layer showed a long lifetime LT95 of 540 h @ 1000 cd m -2 as well as a maximal current efficiency of 5.24 cd A -1 , an external quantum efficiency of 5.49% and CIE (0.126, 0.118) [10][11][12] .…”