Order Code: M491
MSDS sheet


(excluding Taxes)


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 99.6% (sublimed)
Melting point > 300 °C
Colour Red powder

 *Sublimation is a technique used to obtain ultra pure-grade chemicals by removing trace metals and inorganic impurities. For more details about sublimation, please refer to sublimed materials for OLEDs and perovskites and our collection of sublimed materials.


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),