Entrance, Bulae Library, Lae

View to entrance from exterior.

Polarized photoluminescence from surface-passivated lead sulfide nanocrystals

Effective surface passivation of lead sulfide (PbS) nanocrystals (NCs) in an aqueous colloidal solution has been achieved following treatment with CdS precursors. The resultant photoluminescent emission displays two distinct components, one originating from the absorption band edge and the other from above the absorption band edge. We show that both of these components are strongly polarized but display distinctly different behaviours. The polarization arising from the band edge shows little dependence on the excitation energy while the polarization of the above-band-edge component is strongly dependent on the excitation energy. In addition, time-resolved polarization spectroscopy reveals that the above-band-edge polarization is restricted to the first couple of nanoseconds, while the band edge polarization is nearly constant over hundreds of nanoseconds. We recognize an incompatibility between the two different polarization behaviours, which enables us to identify two distinct types of surface-passivated PbS NC.

Corner connection detail, Sunshine Coast University Library, Maroochydore

Detailed external view of north-west elevation corner.

North-west elevation, Sunshine Coast University Library, Maroochydore

North-west elevation as seen from library forecourt.

Northern entrance court under construction, Sunshine Coast University Library, Maroochydore

View to library entrance court under construction.

North-west elevation and entrance court, Sunshine Coast University Library, Maroochydore

View of entrance court under construction, with north-west elevation behind.

Part of south-east elevation, Sunshine Coast University Library, Maroochydore

View to part of south-east elevation with skillion roof, corrugated steel sheeting and concrete block.

Steel cladding to south-east corner, Sunshine Coast University Library, Maroochydore

View to south-east corner, clad in corrugated steel sheeting with colonnade below.

Colonnade to south-west elevation, Sunshine Coast University Library, Maroochydore

View from south-east as seen from exterior.

Entrance verandah, Sunshine Coast University Library, Maroochydore

View along north-east entrance verandah.

Second floor reading area interior, Sunshine Coast University Library, Maroochydore

View of second floor reading area with rigid frames and air-conditioning ducting.

Roof and eaves gutter, Sunshine Coast University Library, Maroochydore

Detail view of corrugated steel roofing, polycarbonate sheeting, plywood cladding, eaves gutter and downpipe.

Sunshine Coast University Library, Maroochydore

Library and Building K as seen from outer ring road

Sunshine Coast University Library, Maroochydore

Library and Building K as seen from outer ring road.

North-west elevation, Sunshine Coast University Library, Maroochydore

Library and Building K as seen from outer ring road.