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Systems that show circularly polarized luminescence (CPL) are usually constructed in one of two possible ways: either covalently binding the chiral moieties (usually organic compounds) to luminophores (inorganic or organic compounds) or associating the luminophores as guests with chiral hosts (usually organic compounds). Herein, we propose inorganicbased CPL-active systems constructed by the “chiral hostluminescent guest” strategy, in which silica acts as a chiral host to endow various luminescent guests with CPL. The chiral silica was modified by silane coupling with amino or phenyl groups to allow interaction with luminescent guests, and then used in combination with acidic achiral dyes, lead-halide type perovskites, and aggregation-induced emission luminogens (AIEgens). Interestingly, when these achiral guests were noncovalently confined in surface-modified chiral silica, the guests showed chiroptical behavior in the circular dichroism (CD) spectra, and thus became CPL active, even though they are not inherently chiral. The surface functional groups on the silica play very important roles in transferring the chiral information from the silica to the guests. This work provides a new concept for constructing CPL-active systems using inorganic materials as a chiral source. [ABSTRACT FROM AUTHOR]

Efficacious white OLED devices have been developed for lighting applications. The high efficacy was achieved by incorporating two key technologies: a 3-unit tandem hybrid device architecture and a random scattering light extraction enhancement structure. The light extraction enhancement structure was used for both external (EES) and internal (IES) applications. Laboratory results showed an EES device with 73.6 lm/W efficacy and an IES device with 111.7 lm/W efficacy. The 3-unit tandem structure and EES were also applied to production line devices and achieved over 80 lm/W efficacy at 1000 cd/m2 and over 60 lm/W at 3000 cd/m2. [ABSTRACT FROM AUTHOR]