40‐4: High‐Temperature Operational Stability of Deep‐Red Phosphorescent OLED with Exciplex‐Forming Host Material and Guest Material

Abstract

Our deep-red phosphorescent organic light-emitting diode (OLED) demonstrated a long lifetime at 85C. This durability was derived not only from a stable exciplex host but also from a dopant with high thermal resistivity. The exciplex host made by a premix technique also worked as well as that made by codeposition. Author KeywordsOLED; Red phosphorescent OLED; high-temperature operational stability; exciplex; premix.

Exceedingly Stable Luminescent Dinuclear Pt(II) Complexes with Ditopic Formamidinate Bridging Ligands for High‐Performance Red and Deep‐Red OLEDs with LT97up to 2446 h at 1000 cd m−2

“…The EQE and LT values of the literature‐reported red and deep red‐emitting OLEDs with different emission mechanisms, including phosphorescence, thermally activated delayed fluorescence (TADF), and TADF sensitized fluorescence (TASF), are given in Table S9, Supporting Information. [ 21–28 ] For comparison purposes, LT 97 and LT 90 values at an L 0 of 1000 cd m −2 were estimated from the diagram included in the literature and by assuming an acceleration coefficient of 1.7 for all the results listed in Table S9, Supporting Information, in addition to the measured values. To our knowledge, the operational stability of 4(C) ‐based OLED is the best among those of literature‐reported deep red/NIR OLEDs having an emission λ max beyond 650 nm.…”

“…To our knowledge, the operational stability of 4(C) ‐based OLED is the best among those of literature‐reported deep red/NIR OLEDs having an emission λ max beyond 650 nm. [ 25,26 ] LT 97 of 2446 h for 3(C) ‐based OLED is almost half of that (5012 h) of the commercial phosphorescent emitter RD03 at 1000 cd m −2 at room temperature, [ 28 ] revealing the practical industrial application of 3(C) .…”

“…The results are depicted in Table 2 and Figure S9, Supporting Information. [21][22][23][24][25][26][27][28] For comparison purposes, LT 97 and LT 90 values at an L 0 of 1000 cd m −2 were estimated from the diagram included in the literature and by assuming an acceleration coefficient of 1.7 for all the results listed in Table S9, Supporting Information, in addition to the measured values. To our knowledge, the operational stability of 4(C)-based OLED is the best among those of literature-reported deep red/NIR OLEDs having an emission λ max beyond 650 nm.…”

A Simple Molecular Design Strategy for Pure‐Red Multiple Resonance Emitters

“…The operational stability of the EL was further evaluated at an initial brightness of 10 000 cd m −2 , yielding a significantly long T99 lifetime of more than 43 hours (time to lose 1 % of initial brightness), which is one of the longest reported lifetimes for red OLEDs (Figure 4d). [13] These unprecedented high performances demonstrate the enormous potential of this molecular design strategy.…”

“…The simple molecular structure and high yield suggest that PPZ-BN has great potential for practical applications, and further structural modifications are expected in the future to meet different functionalization needs. The structures of all synthesized materials were characterized by 1 H and 13 C nuclear magnetic resonance (NMR) spectrometry, mass spectrometry, and elemental analysis (please see the Supporting Information).…”