Vapor deposition apparatus for using solid starting materials

A vapor deposition apparatus for depositing an electroluminescent film on a plurality of substrates, comprising:

• a vertically-oriented main reaction tube having a top and a bottom, said main reaction tube having a gas vent at said bottom, the plurality of substrates being vertically oriented within said main reaction tube;
• two horizontally-oriented branch reaction tubes connected to said top of the main reaction tube, each of said branch reaction tubes containing a solid starting material and having a gas inlet at its free end;
• a baffle arranged between said main reaction tube and said branch reaction tubes;
• and
• heating means for heating said main and branch reaction tubes;
• wherein carrier gas introduced into said branch reaction tubes at said gas inlets is mixed by said baffle arrangement and vertically transported over said plurality of vertically oriented substrates and exhausted from said main reaction tube at said gas vent such that deposition of said film on said plurality of substrates is by the vertical flow of said mixed carrier gas.