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Indium(III) phosphide

Electronic Properties

IUPAC name	Indium phosphide
Other names	Indium(III) phosphide
Identifiers
CAS number	22398-80-7
Properties
Molecular formula	InP
Molar mass	145.792 g/mol
Appearance	Black cubic crystals.
Density	4.81 g/cm³, solid.
Melting point	1062°C (1335.15 K)
Boiling point	No information.
Solubility in water	? g/100 ml (?°C)
Structure
Crystal structure	FCC
Hazards
Main hazards	In Compounds: Highly toxic via subcutaneous and moderately toxic via oral routes. Symptoms of acute indium intoxication are anorexia, localized convulsive motions, hind-leg paralysis, pulmonary edema, necrotizing pneumonia, and renal and hepatic damage with resultant dysfunction. Chronic indium intoxication leads to weight loss, poor growth, and extensive necrotic damage to the liver and kidneys.
Related Compounds
Other anions	InN, InAs, InSb.
Other cations	Gallium phosphide, Aluminium phosphide
Related compounds	Gallium arsenide phosphide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Indium phosphide (In P) is a binary semiconductor composed of indium and phosphorus. It is used in high-power and high-frequency electronics because of its superior electron velocity with respect to the more common semiconductors silicon and gallium arsenide. It also has a direct bandgap, making it useful for optoelectronics devices like laser diodes.

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InP is also used as a substrate for epitaxial indium gallium arsenide based opto-electronic devices.

Indium phosphide also has one of the longest-lived optical phonons of any compound with the zincblende crystal structure.

Optical properties

The Sellmeier equation that describes how the optical refractive index for indium phosphide depends on wavelength is given by $n^2(\lambda) = 7.255 + \frac{2.316 \lambda^2 }{ \lambda^2 - 0.6263^2} + \frac{2.765 \lambda^2 }{ \lambda^2 - 32.935^2},$ where λ is the wavelength in micrometres.