A composition formed from ingredients comprising: an epoxy; a polyvinyl phenol; a cross-linking agent; an epoxy silane; and a solvent is disclosed. A printable medium and other devices made from the composition are also disclosed.

A stack of layers 100, a lamp, a luminaire and a method of manufacturing a stack of layers is disclosed. The stack of layers 100 comprises a first outer layer 102, a second outer layer 106 and a luminescent layer 104. The first outer layer 102 and the second outer layer 106 are of a light transmitting polymeric material and have an oxygen transmission rate lower than 30 cm3/(m2-day) measured under standard temperature and pressure (STP). The luminescent layer 104 is sandwiched between the first outer layer 102 and the second outer layer 106 and comprises a light transmitting matrix polymer and a luminescent material 108 being configured to absorb light according to an absorption spectrum and convert a portion of the absorbed light towards light of a light emission spectrum.

A stack of layers 100, a lamp, a luminaire and a method of manufacturing a stack of layers is disclosed. The stack of layers 100 comprises a first outer layer 102, a second outer layer 106 and a luminescent layer 104. The first outer layer 102 and the second outer layer 106 are of a light transmitting polymeric material and have an oxygen transmission rate lower than 30 cm3/(m2-day) measured under standard temperature and pressure (STP). The luminescent layer 104 is sandwiched between the first outer layer 102 and the second outer layer 106 and comprises a light transmitting matrix polymer and a luminescent material 108 being configured to absorb light according to an absorption spectrum and convert a portion of the absorbed light towards light of a light emission spectrum.

A composition for forming an organic film contains: (A) a material for forming an organic film; (B) an aryl benzyl ether compound having a partial structure represented by the following general formula (B1); and (C) a solvent, where R.sub.1 represents a group represented by the following formula (B2-1) or either of groups containing fluorine represented by the following formulae (B2-2), R.sub.2 represents a saturated or unsaturated monovalent organic group having 1 to 30 carbon atoms, a represents 0 or 1, provided that when a is 0, b represents 1 to 5 and c represents 0 to 4, and when a is 1, b represents 1 to 7 and c represents 0 to 6, and * represents an attachment point to another atom.

##STR00001##

A composition for forming an organic film contains: (A) a material for forming an organic film; (B) an aryl benzyl ether compound having a partial structure represented by the following general formula (B1); and (C) a solvent, where R.sub.1 represents a group represented by the following formula (B2-1) or either of groups containing fluorine represented by the following formulae (B2-2), R.sub.2 represents a saturated or unsaturated monovalent organic group having 1 to 30 carbon atoms, a represents 0 or 1, provided that when a is 0, b represents 1 to 5 and c represents 0 to 4, and when a is 1, b represents 1 to 7 and c represents 0 to 6, and * represents an attachment point to another atom.

##STR00001##