Enhanced Circularly Polarized Luminescence Activity in Chiral Platinum(II) Complexes With Bis- or Triphenylphosphine Ligands oleh Qian-Ying Yang, Hua-Hong Zhang, Xue-Ling Han, Shi-Dao Weng, Yuan Chen, Jia-Li Wu, Li-Zhi Han, Xiao-Peng Zhang, Zai-Feng Shi