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We present the improved constraints on couplings of solar axions and moregeneric bosonic dark matter particles using 737.1 kg-days of data from theCDEX-1B experiment. The CDEX-1B experiment, located at the China JinpingUnderground Laboratory, primarily aims at the direct detection of weaklyinteracting massive particles using a p-type point-contact germanium detector.We adopt the profile likelihood ratio method for analysis of data in thepresence of backgrounds. An energy threshold of 160 eV was achieved, muchbetter than the 475 eV of CDEX-1A with an exposure of 335.6 kg-days. Thissignificantly improves the sensitivity for the bosonic dark matter below 0.8keV among germanium detectors. Limits are also placed on the coupling $g_{Ae} <2.48 \times 10^{-11}$ from Compton, bremsstrahlung, atomic-recombination andde-excitation channels and $g^{eff}_{AN} \times g_{Ae} < 4.14 \times 10^{-17}$from a $^{57}$Fe M1 transition at 90\% confidence level.

Improved limits on solar axions and bosonic dark matter from the CDEX-1B experiment using the profile likelihood ratio method