Journal Article organic-inorganic hybrid perovskite LEDs blue emitting devices cathode interlayers circularly polarized lasing color tunable complementary absorption conjugated polyelectrolytes crystal sizes flexible membrane inverted polymer solar cells laser layered structures liquid crystals naphtho[1,2-c:5,6-c']bis([1,2,5]thiadiazole) narrow bandgap nonfullerene polymer solar cells perovskite nanocrystals polymer solar cells prediction radiative efficiency recombination dynamics self-assembly solvent additives structure modulation wide-bandgap donors π-conjugated polymers