  A scintillating bolometer technology based on $^{100}$Mo-enriched lithium
molybdate (Li$_2$$^{100}$MoO$_4$) crystals has been developed by LUMINEU to
search for neutrinoless double-beta ($0\nu 2\beta$) decay of $^{100}$Mo. The
results of several low temperature tests at underground environments have
proved the reproducibility of high detector performance and crystal
radiopurity: in particular $\sim$5--6~keV FWHM energy resolution and at least
9$\sigma$ rejection of $\alpha$'s in the vicinity of the $0\nu 2\beta$ decay of
$^{100}$Mo (3034 keV) and below 10~$\mu$Bq/kg bulk activity of $^{228}$Th and
$^{226}$Ra. A modest acquired exposure (0.1~kg$\times$yr) is a limiting factor
of the LUMINEU experiment sensitivity to the $0\nu 2\beta$ decay half-life of
$^{100}$Mo ($T_{1/2}$ $\geq$ 0.7$\times$10$^{23}$ yr at 90\% C.L.), however the
two-neutrino $2\beta$ decay has been measured with the best up to-date
accuracy, $T_{1/2}$ = $\left[6.92 \pm 0.06(\mathrm{stat.}) \pm
0.36(\mathrm{syst.})\right] \times 10^{18}$ yr. The applicability of the
LUMINEU technology for a tonne-scale $0\nu 2\beta$ decay bolometric project
CUPID is going to be demonstrated by the CUPID-0/Mo experiment with $\sim$5~kg
of $^{100}$Mo embedded in forty 0.2~kg Li$_2$$^{100}$MoO$_4$ scintillating
bolometers. A first phase of the experiment with twenty Li$_2$$^{100}$MoO$_4$
detectors is in preparation at the Modane underground laboratory (France) to
start by the end of 2017.
