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Emission of the $a3\Sigma +(u)(a11(u))-X1\Sigma +(g)(XO+(g))$ transitions of $Sb2,BiN,BiP,BiAs,BiSb,andBi2$ has been observed in the near-infrared spectral region between 3800 and $11000cm-1$ from chemical reactions in fast flow systems. The spectra consisting of short sequences of red-degraded bands were measured at medium and high resolution with a Fourier-transform spectrometer. Vibrational analyses have yielded the following molecular constants of the $X0+(g)$ and $a11(u)$ states of the molecules (in $cm-1$); [FIGURE] Other new emission systems of BiN have been assigned to the transitions $b5\Sigma +(b10+)-X1\Sigma +(XO+)$ and $b5\Sigma +(b10+)-a3\Sigma +(a11)$. The spectra of BiN, BiP, BiAs and $Bi2$ have been measured at high resolution and accurate molecular constants of the states have been deduced.