Order Code: M491
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 Grade Order Code Quantity Price
Sublimed (>99.0% purity) M491 100 mg £199.00
Sublimed (>99.0% purity) M491 250 mg £399.00
Sublimed (>99.0% purity) M491 500 mg £689.00

General Information

CAS number 405289-74-9
Chemical formula C39H24IrN3S3
Molecular weight 823.08 g/mol
Absorption λmax 292, 366, 408 nm in THF
Fluorescence λem 596, 645 nm in THF
HOMO/LUMO HOMO 5.08 eV; LUMO 2.67 eV [1]
  • Tris(2-(benzo[b]thiophen-2-yl)pyridineiridium(III); 
  • Tris[2-(benzo[b]thiophen-2-yl)pyridinato-C3,N]iridium(III)
  • fac-Tris[2-(benzo[b]thiophen-2-yl)pyridinato-C3,N]iridium(III)
  • fac-Ir(btpy)3, Tris(2-(benzo[b]thiophen-2-yl)pyridineiridium(III) 
Classification / Family Organometallic complex, phosphorescent red emitter, phosphorescence dopant OLEDs, polymer solar cells, sublimed materials


Product Details

Purity >99.0% (sublimed)
Melting point > 300 °C
Colour Red powder

*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the Sublimed Materials for OLED devices page.


Chemical Structure

 ir(btpy)3 chemical structure
Chemical Structure of Tris(2-(benzo[b]thiophen-2-yl)pyridineiridium(III) [Ir(btpy)3]; CAS No. 405289-74-9; Chemical Formula C39H24IrN3S3



Tris(2-(benzo[b]thiophen-2-yl)pyridineiridium, known as Ir(btpy)3, is an efficient red phosphorescent emitter (PHOLED). It is commonly used in organic light-emitting diodes and polymer solar cells as a dopant, and in barometric pressure probes due to its sensitivity to oxygen [2].

Wang et al. demonstrated that a higher Ir(btpy)3 doping concentration is beneficial to photon harvesting in the active layer, but the interpenetrating network of P3HT:PCBM can be damaged through high-temperature annealing treatment [3].




1H NMR Ir(btpy)3

 1H NMR of fac-Tris[2-(benzo[b]thiophen-2-yl)pyridinato-C3,N]iridium(III) Ir(btpy)3 in CDCl3.


HPLC ir(btpy)3

HPLC trace of Tris[2-(benzo[b]thiophen-2-yl)pyridinato-C3,N]iridium(III), Ir(btpy)3.


Literature and Reviews

  1. The Red Electroluminescence of Iridium Complex at Different Concentrations and Host Materials, W. Zhang et al., Appl. Mechanics and Mater., Ch. 2, 94-97 (2014); DIO: 10.4028/
  2. Structure–Property Relationship of Red- and Green-Emitting Iridium(III) Complexes with Respect to Their Temperature and Oxygen Sensitivity, N. Tian et al., Eur. J. Inorg. Chem. 2010, 4875–4885, DOI: 10.1002/ejic.201000610.
  3. Effect of Doping Phosphorescent Material and Annealing Treatment on the Performance of Polymer Solar Cells, Z. Wang et al., Inter. J. Photoenergy, 273586 (2013),
  4. Red-green-blue polymer light-emitting diode pixels printed by optimized laser-induced forward transfer, J. Stewart et al., Appl. Phys. Lett. 100, 203303 (2012);
  5. Homoleptic Cyclometalated Iridium Complexes with Highly Efficient Red Phosphorescence and Application to Organic Light-Emitting Diode, A. Tsuboyama et al., J. Am. Chem. Soc., 125, 12971-12979 (2003), DOI: 10.1021/ja034732d.
  6. Photopolymerization of N-Vinylcarbazole Using Visible-Light Harvesting Iridium Complexes as Photoinitiators, J. Lalevee et al., Macromolecules 45, 4134−4141 (2012),