| 摘要 |
<p>A low-pressure mercury vapour discharge lamp having a very satisfactory colour rendition (R(a,8) ≥ 85) and having a colour temperature of at least 3200 K and a colour point located on or near the Planckian locus. The lamp is provided with a luminescent layer comprising :
<UnorderedLists id="ula01" listStyle="none"><ListItem>a. a luminescent alkaline earth metal halophosphate activated by Sb<Sup>3+</Sup> or by Sb<Sup>3+</Sup> and Mn<Sup>2+</Sup></ListItem><ListItem>b. a luminescent material activated by Eu<Sup>2*</Sup> and having an emission maximum at 470-500 nm and a half-width value of at most 90 nm and</ListItem><ListItem>c. a luminescent rare earth metal metaborate activated by Ce<Sup>3+</Sup> and Mn<Sup>2-</Sup> and having a fundamental lattice Ln(Mg,Zn,Cd)B<Sub>5</Sub>O<Sub>10</Sub>, where Ln represents the elements Y, La and/or Gd, which borate has a red Mn<Sup>2+</Sup> emission.</ListItem></UnorderedLists></p><p>Preferably, the luminescent layer comprises :
<UnorderedLists id="ula02" listStyle="none"><ListItem>d a luminescent material activated by Tb<Sup>3+</Sup> and having green Tb<Sup>3+</Sup> emission.</ListItem></UnorderedLists></p><p>With these lamps, the phenomenon of disruption of metamery is completely or substantially completely avoided. Furthermore, the lamps have a high luminous flux and a high maintenance of the luminous flux during the life.</p> |
