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SUMMARY:Correlating broadband emission and structural dynamics in hybrid ha
 lide perovskites
LOCATION:Virtual Seminar
TZID:America/Denver
DTSTART:20210430T160000
UID:2026-04-28-12-33-40@natsci.colostate.edu
DTSTAMP:20260428T123340
Description:Research Seminar\n\nIntrinsic broadband white light emission ha
 s been observed in layered hybrid organic-inorganic perovskites with the f
 ormula (R-NH3+)PbBr4 and previously correlated to static lattice distorti
 ons. The structure and relevant electronic states of the inorganic layer a
 re impacted by choice of the organic spacer cation (R-NH3+). The emission 
 and structural dependence on the organic cation suggest the movement of th
 e organic moieties within the crystal may play a role in the inorganic oct
 ahedral tilt angles and\, therefore\, broadband emission. We have prepared
  a series of lead bromide HOIPs with varying white light emission\; (nBA)2
 PbBr4\, (ODA)PbBr4\, (GABA)2PbBr4 (nBA = n-butylammonium\, ODA = 1\,8-di
 aminooctammonium\, GABA = 4-aminobutyric acid). Using quasielastic neutron
  scattering and photoluminescence\, we correlate more intense broadband em
 ission with materials exhibiting slower cation dynamics. Slower cation dyn
 amics compared to (nBA)2PbBr4 were observed concurrently with an increase
  in broadband emission for the ODA and GABA-derived samples. This work sho
 ws the intensity of the observed emission is dependent on the lattice dyna
 mics and the organic cation\, suggesting these dynamics are coupled.\n\n&n
 bsp\;\n\nZoom Link\n\nMeeting ID: 910 3548 1538\nPasscode: 578313 4:00 pm
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