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Related Experiment Video

Updated: Apr 22, 2026

Exfoliation of Egyptian Blue and Han Blue, Two Alkali Earth Copper Silicate-based Pigments

Exfoliation of Egyptian Blue and Han Blue, Two Alkali Earth Copper Silicate-based Pigments

Published on: April 24, 2014

Simple and extremely efficient blue emitters based on mononuclear Cu(I)-halide complexes with delayed fluorescence.

Hiroki Ohara¹, Atsushi Kobayashi, Masako Kato

¹Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan. mkato@sci.hokudai.ac.jp.

Dalton Transactions (Cambridge, England : 2003)

|October 16, 2014

Summary

New copper(I) halide complexes offer bright blue light emission with near 100% quantum yields. These materials utilize delayed fluorescence and phosphorescence, making them promising for cost-effective pure-blue emitters.

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Area of Science:

Inorganic Chemistry
Materials Science
Photophysics

Background:

Metal-halide complexes are explored for luminescent properties.
Ternary ligand systems offer tunable electronic and structural characteristics.
Developing efficient pure-blue emitters remains a challenge in materials science.

Purpose of the Study:

To synthesize and characterize novel mononuclear copper(I)-halide complexes.
To investigate the photoluminescence properties, particularly the origin of blue emission.
To evaluate their potential as cost-effective pure-blue light-emitting materials.

Main Methods:

Synthesis of mononuclear Cu(I)-halide complexes with triphenylphosphine and 4-methylpyridine ligands.
Photoluminescence quantum yield measurements.
Emission lifetime analyses.
Density functional theory (DFT) calculations.

Main Results:

Complexes [CuX(PPh3)2(4-Mepy)] (X = Cl, Br, I) were successfully prepared.
Achieved extremely high photoluminescence quantum yields (approaching 100%) in crystals.
Identified the emission mechanism as predominantly delayed fluorescence from singlet (1)(M + X)LCT at room temperature and phosphorescence from triplet (3)(M + X)LCT at 77 K.
Observed small singlet-triplet energy differences (ΔE = 940–1170 cm(-1)).

Conclusions:

Ternary ligand systems comprising halide, bulky phosphine, and N-heteroaromatic ligands yield inexpensive pure-blue emitters.
The facile fabrication via simple manual grinding enhances their practical applicability.
These copper(I) complexes represent a promising class of materials for efficient pure-blue light emission.