OLED_TADF_20260405_03-04

Table of Contents

0) まずは超要約 / Quick primer

TADF recycles triplet excitons back to emissive singlets using thermal activation, improving OLED efficiency.
Efficiency roll‑off is the drop in efficiency at high brightness—critical for real devices.
CP‑OLEDs emit circularly polarized light, relevant to 3D displays and photonic devices.

ADVANCED MATERIALS（JIF 26.8）— Heavy Chalcogen Elements in OLEDs: Advances of Sulfur and Selenium for Organic Light-Emitting Materials — DOI: 10.1002/adma.202521581
ADVANCED FUNCTIONAL MATERIALS（JIF 19.0）— Uncovering the Origin of Efficiency Roll-Off in TADF OLEDs — DOI: 10.1002/adfm.202531845
CHEMICAL ENGINEERING JOURNAL（JIF 13.2）— Balancing efficiency and circular polarization in CP-OLEDs: chiral alkyl-substituted dicyanoquinoxaline-based TADF emitters — DOI: 10.1016/j.cej.2026.174414

掲載誌：ADVANCED MATERIALS（JIF 26.8）
年：2026
DOI：10.1002/adma.202521581
ポイント（わかりやすい箇条書き）
テーマ：硫黄（S）・セレン（Se）といった「重いカルコゲン元素」を有機分子へ導入し、発光過程（励起状態ダイナミクス）を制御してOLED性能を高める研究動向をまとめた総説。
キーワード：重原子効果でスピン軌道相互作用を強め、TADFや室温りん光（RTP）で励起子を“使い切る”設計につなげる。
扱う範囲：D–A型TADF、MR‑TADF、純有機RTPなど多様な枠組みでのS/Se活用例を整理。
応用の広がり：発光体だけでなく、硫黄含有ユニットをホスト材料へ使う方向性も示し、材料設計の選択肢を拡張。

Journal: ADVANCED MATERIALS (JIF 26.8)
Year: 2026
DOI: 10.1002/adma.202521581
Key points (rephrased; no abstract text copied)
Topic: a review on using heavy chalcogen elements (S/Se) in organic molecules to tune excited‑state dynamics and enhance OLED performance.
Key idea: heavy‑atom effects can strengthen spin–orbit coupling, helping exciton utilization in TADF and room‑temperature phosphorescence (RTP).
Scope: covers donor–acceptor TADF, multiple‑resonance (MR) TADF, and purely organic RTP frameworks, highlighting design patterns.
Broader impact: also discusses sulfur‑containing units in host materials, expanding practical materials choices.

Journal: ADVANCED FUNCTIONAL MATERIALS (JIF 19.0)
Year: 2026
DOI: 10.1002/adfm.202531845
Key points (rephrased; no abstract text copied)
Problem: TADF OLEDs often suffer from efficiency “roll‑off” at high brightness.
Approach: an in‑operando frequency‑domain method is used to access rate constants that are hard to extract with conventional techniques.
Finding: roll‑off arises from a combined interplay of singlet–triplet annihilation (STA), singlet–polaron annihilation (SPA), and triplet–polaron annihilation (TPA), with quantified contributions.
Why it matters: separating and quantifying loss channels points directly to where materials and device stacks should be improved.

Journal: CHEMICAL ENGINEERING JOURNAL (JIF 13.2)
Year: 2026
DOI: 10.1016/j.cej.2026.174414
Key points (rephrased; no abstract text copied)
Goal: balance high EQE and meaningful circular polarization (gEL) in circularly polarized OLEDs (CP‑OLEDs).
Design: chiral CP‑TADF enantiomers are built using camphorquinone; acceptor engineering shifts the emission mechanism toward intrinsically efficient TADF.
Materials: reports high thermal stability (Td > 446 °C), small ΔEST (<0.3 eV), and high PLQY (e.g., 89.5%).
Devices: achieves EQEmax 31.83% at 532 nm without a sensitization layer and reports gEL values.
Impact: supports practical high‑efficiency CP‑OLED materials for 3D/photonic display technologies.

Li, MK; Chen, ZJ; Su, SJ. Heavy Chalcogen Elements in OLEDs: Advances of Sulfur and Selenium for Organic Light-Emitting Materials. ADVANCED MATERIALS (2026). DOI: 10.1002/adma.202521581.
King, LG; Yoshida, K; Ruseckas, A; Samuel, IDW. Uncovering the Origin of Efficiency Roll-Off in TADF OLEDs. ADVANCED FUNCTIONAL MATERIALS (2026). DOI: 10.1002/adfm.202531845.
Fan, TW; Nie, XW; Xu, LX; Wang, T; Liu, WH; Wang, LY; Tang, H; Su, SJ; Cao, DR. Balancing efficiency and circular polarization in CP-OLEDs: chiral alkyl-substituted dicyanoquinoxaline-based TADF emitters. CHEMICAL ENGINEERING JOURNAL (2026). DOI: 10.1016/j.cej.2026.174414.