Strong magnetic fields are a powerful tool for studying physical properties of low-dimensional semiconductor structures. The pulsed magnet facilities at the Los Alamos National High Magnetic Field Laboratory (NHMFL) have provided an unique opportunity to explore new correlated electronic phases of quantum Hall devices in ultra-high magnetic fields. We have performed both magneto-transport and photoluminescence experiments in the pulsed magnet for fields up to 50 T and temperatures down to 500 mK to study several types of GaAs/AlGaAs heterostructures. The findings of our exploratory experiments are summarized.