Principles of Luminescence

Light-Emitting Devices – Luminescence from Low-Dimensional Nanostructures

“…Like semiconductors, these organic materials show other conductivity characteristics under an electrical field between two electrodes. Analogous to p-n junction semiconductors, the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) are regarded as the valance and conduction bands, respectively, of inorganic semiconductors [7]. Figure 4 shows the basic schematic structure of an OLED, which can also consist of an electron transport layer and hole transport layer.…”

“…The released energy from this recombination can result in the emission of photons or Auger electrons [7]. In photoluminescence, the recombination of electron and hole cause the radiation of a photon.…”

Synthesis of fluorescent core-shell nanomaterials and strategies to generate white light

“…[1][2][3][4][5][6][7][8][9][10][11][12] Among them, Mn and Cu-doped semiconductor nanocrystals were of great importance as Mn provides a short-range emission and Cu results in a host bandgapdependent wide range tunable emission. 11,12 Therefore, their tunable PL emissions can be used to generate white light.…”

“…The quality of a white light source is usually evaluated by three performance parameters: CIE, CRI, and CCT. 10 In CIE (Commission Internationale del' Eclairage) color diagram, a perfect white light is produced at a point (x, y) ¼ (0.33, 0.33). 10 Color rendering index (CRI) is the measure of color rendition of the white light source.…”

“…10 In CIE (Commission Internationale del' Eclairage) color diagram, a perfect white light is produced at a point (x, y) ¼ (0.33, 0.33). 10 Color rendering index (CRI) is the measure of color rendition of the white light source. The best color rendition is expressed with a CRI of 100, whereas the CRI of the poorest color rendition is expressed as À100.…”