BAND EDGE
A Century of Excitons: From Frenkel's 1931 Idea to a Room-Temperature Switch
From a 1931 theoretical quasiparticle to a gated exciton switch at room temperature — the history of the exciton, with the hype stripped out.
BAND EDGE · Overflow section
Band Edge
The frontiers beyond the four desks — occasional coverage of Solar & Energy, Sensing & Bio, special reports, and emerging topics. Overflow, not a desk: no daily quota.
Band Edge is overflow, not a desk: occasional coverage, no daily quota.
BAND EDGE
How the Field Actually Moves: Conferences, Labs, and Methods
Excitonics does not advance by press release. It advances through conferences, shared methods, slow replication, and the unglamorous work of making measurements comparable.
BAND EDGE
Excitonic Bio-Photonics: Probes, Imaging, and Clinical Limits
Excitonic probes make biology glow — but the gap between a beautiful image in a research lab and a safe, approved clinical tool is wide, regulated, and often underestimated.
BAND EDGE
Excitonic Sensing: From FRET Assays to Quantum-Dot Diagnostics
Excitonic sensing turns molecular proximity into light: energy hops between molecules and dots, and the color and timing of what comes back reveals what is present, how much, and how close.
BAND EDGE
Excitonic Solar: Can Excitons Make Better Photovoltaics?
Excitons are both the promise and the problem for excitonic solar cells: they carry absorbed sunlight, but they must be split apart before they can become electricity.
BAND EDGE
What Is the Band Edge?
The band edge is where a semiconductor stops being transparent and starts being alive — the energy boundary that sets what light a material can absorb, emit, and turn into an exciton.