Emerging Potential of Coinage‑Metal TADF Complexes

In recent years, a series of two‑coordinate complexes based on coinage metals (copper, silver, and gold) have emerged as a new class of thermally activated delayed fluorescence (TADF) emitters, demonstrating great potential in photoluminescence mechanism studies, electroluminescent devices, photocatalysis, and other fields.

Breakthrough in Cu(I) TADF Materials by Prof. Li’s Team

Prof. Tianyi Li’s research team at the University of Science and Technology Beijing successfully prepared a series of Cu(I) TADF complexes with tunable configurations. The rotation‑restricted twisted conformation of these complexes effectively suppresses non‑radiative energy loss, achieving a high photoluminescence quantum yield of 74% and a short TADF lifetime of 1.9 ms in blue‑emitting TADF complexes. In doped light‑emitting layer devices, the maximum external quantum efficiency can reach 20%. Even in non‑doped devices, the maximum external quantum efficiency can achieve 10%, with an efficiency roll‑off of less than 2% at a brightness of 100 cd/m².

Exclusive Supply of High‑Performance TADF Complexes by J&K Scientific

J&K Scientific exclusively supplies a series of coinage‑metal TADF complexes developed by Prof. Tianyi Li’s research group. These complexes feature diverse structures, excellent performance, and good stability, offering broad application prospects.

Advantages and Details of Cu(I) TADF Complex Products:

1. Excellent Performance Parameters:
   • Small singlet‑triplet energy gap (ΔEST down to 120 meV)
   • High radiative rate constant (kr,S1 up to 1.3 × 10⁵ s⁻¹)
   • High photoluminescence quantum yield (up to 74%)
   • Short TADF lifetime (as fast as 1.9 ms)

2. Outstanding Electroluminescence Performance:
   • In doped emissive layers of vacuum‑deposited OLEDs, maximum external quantum efficiency (EQE) reaches 20%
   • In non‑doped devices, maximum EQE achieves 10%
   • Efficiency roll‑off of less than 2% at 100 cd/m² brightness

3. Tunable Structure and Configuration:
   • Using indole‑based arylamine ligands, substituents with varying steric and electronic effects introduced at the 2‑position of the indole moiety allow the complex geometry to be tuned from coplanar to 45°‑twisted and even orthogonal configurations.

4. Suppressed Energy Loss:
   • The rotation‑restricted twisted conformation effectively suppresses non‑radiative transition energy losses.

5. Significant Comprehensive Advantages:
   • Compared with phosphorescent noble‑metal (Ir, Pt) complexes, Cu(I) TADF materials offer higher luminescence efficiency, shorter emission lifetime, flexible color tunability, and improved stability.
   • They are cost‑effective and easier to synthesize.

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