Abstract

Recent reports^1,2 by Philips researchers on novel, efficient phosphors for lamp applications highlight the role of Gd³⁺ as sensitization intermediate in the process of cascade sensitization S→Gd³⁺→A (where S is a broad-band sensitizers, such as Ce³⁺ or Bi³⁺, and A an acceptor, such as a trivalent rare-earth or Mn²⁺). On investigating Ce, Mn-coactivated Gd(BO₂)₃ we observed, following excitation at 254 nm, a green emission-band, peaking at ≃530 nm, ≃60% as intense (in brightness units) as current willemite phosphors (Zn₂SiO₄:Mn) for lamp applications.

© 1984 Optical Society of America