A thin-film phosphor layer can be formed by an improved deposition method involving: (1) forming a phosphor powder layer that is substantially uniformly-deposited on a substrate surface; and (2) forming a polymer binder layer to fill gaps among loosely packed phosphor particles, thereby forming a substantially continuous layer of thin film.

A thin-film phosphor layer can be formed by an improved deposition method involving: (1) forming a phosphor powder layer that is substantially uniformly-deposited on a substrate surface; and (2) forming a polymer binder layer to fill gaps among loosely packed phosphor particles, thereby forming a substantially continuous layer of thin film.

There is provided an optical member that can achieve a liquid crystal display apparatus having high brightness, an excellent hue, and a high color rendering property. An optical member according to the present invention includes, in the stated order: a first barrier layer; a first wavelength conversion layer; a second wavelength conversion layer; and a second barrier layer. The first wavelength conversion layer includes a matrix and a first wavelength conversion material dispersed in the matrix and having a predetermined center emission wavelength. The second wavelength conversion layer includes a matrix and a second wavelength conversion material dispersed in the matrix and having a center emission wavelength different from that of the first wavelength conversion material.

There is provided an optical member that can achieve a liquid crystal display apparatus having high brightness, an excellent hue, and a high color rendering property. An optical member according to the present invention includes, in the stated order: a first barrier layer; a first wavelength conversion layer; a second wavelength conversion layer; and a second barrier layer. The first wavelength conversion layer includes a matrix and a first wavelength conversion material dispersed in the matrix and having a predetermined center emission wavelength. The second wavelength conversion layer includes a matrix and a second wavelength conversion material dispersed in the matrix and having a center emission wavelength different from that of the first wavelength conversion material.

There is provided an optical member that can achieve a liquid crystal display apparatus having high brightness, an excellent hue, and a high color rendering property. An optical member according to the present invention includes, in the stated order: a first barrier layer; a first wavelength conversion layer; a second wavelength conversion layer; and a second barrier layer. The first wavelength conversion layer includes a matrix and a first wavelength conversion material dispersed in the matrix and having a predetermined center emission wavelength. The second wavelength conversion layer includes a matrix and a second wavelength conversion material dispersed in the matrix and having a center emission wavelength different from that of the first wavelength conversion material.

There is provided an optical member that can achieve a liquid crystal display apparatus having high brightness, an excellent hue, and a high color rendering property. An optical member according to the present invention includes, in the stated order: a first barrier layer; a first wavelength conversion layer; a second wavelength conversion layer; and a second barrier layer. The first wavelength conversion layer includes a matrix and a first wavelength conversion material dispersed in the matrix and having a predetermined center emission wavelength. The second wavelength conversion layer includes a matrix and a second wavelength conversion material dispersed in the matrix and having a center emission wavelength different from that of the first wavelength conversion material.

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.