The Preparation of Other Chalcogenides and Pnictide Nanomaterials - Semiconductor Quantum Dots: Organometallic and Inorganic Synthesis - page 104

The particles could be tuned to emit between 530 and 2000 nm (Figure 4.3),
exhibiting quantum yields typically 20 - 60% with the larger particles having

the lower emission values. 75
A further II 3 - V 2 compound, Zn 3 P 2 , has been prepared by the injection of

(CH 3 ) 2 Zn and HP t Bu 2 into either 4-ethylpyridine or TOPO at a range of
temperatures, resulting in particles 3 - 13 nm in diameter, emitting between

d n 1 y 4 n g | 2

ca. 400 and 600 nm. 76
Other phosphide-based semiconducting systems have also been explored,
including magnetic semiconductors, for which organometallic chemistry
appears ideally suited. The various phases of iron phosphide present a wealth
of materials exhibiting interesting magnetic and optical characteristics. 77
Although one phase (FeP 2 ) is known to be a small-bandgap semiconductor,

.

Figure 4.3 Absorption and emission spectra (a and b respectively) of Cd 3 As 2 QDs
between 2 and 5 nm in diameter. 75 Reprinted with permission from
D. K. Harris, P. M. Allen, H.-S. Han, B. J. Walker, J. Lee and M. G.
Bawendi, J. Am. Chem. Soc. , 2011, 133, 4676. Copyright 2011 American
Chemical Society.