Abstract
Luminescent copper(I) complexes showing thermally activated delayed fluorescence (TADF) have developed to attractive emitter materials for organic light emitting diodes (OLEDs). Here, we study the brightly luminescent dimer Cu2Cl2(P∩N)2 (P∩N = diphenylphosphanyl-6-methyl-pyridine), which shows both TADF and phosphorescence at ambient temperature. A solution-processed OLED with a device structure ITO/PEDOT:PSS/PYD2: Cu2Cl2(P∩N)2/DPEPO (10 nm)/TPBi (40 nm)/LiF (1.2 nm)/Al (100 nm) shows warm white emission with moderate external quantum efficiency (EQE). Methods for EQE increase strategies are discussed.
Highlights
Emerging new display and lighting technologies have considerably stimulated research efforts in the development of new luminescent materials
It was recognized early that phosphorescent heavy/noble metal complexes can fulfill this requirement because of efficient intersystem crossing (ISC) processes facilitated by the high spin-orbit coupling (SOC) induced by the metal center
It has been shown that Organic light emitting diodes (OLEDs) using such complexes can exploit up to 100% of all formed excitons leading to 100% internal quantum efficiency (IQE) [2,3,4,5,6]
Summary
Emerging new display and lighting technologies have considerably stimulated research efforts in the development of new luminescent materials. Copper(I) complexes have proven to feature direct singlet harvesting [45,46] Using this mechanism, that is, applying the efficient TADF due to the distinct metal-to-ligand charge transfer (MLCT) character of signed molecules as OLED emitters, sub-micro second decay times can eas their emissive states [12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32].
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