A display device includes a display panel including a display surface, a light transmission mode converter configured to convert light transmission mode, a light reflective portion disposed on an opposite side of the light transmission mode converter from the display surface and configured to reflect light entered through the display surface toward the display surface, a light transmissive portion disposed on the opposite side of the light transmission mode converter from the display surface and configured to transmit light, and a color filter that is disposed closer to the display surface than the light reflective portion and the light transmissive portion are, and a light storing portion configured to store light to emit light having a complementary color of a color exhibited by the color filter, the light storing portion being disposed on an opposite side of the light transmissive portion from the display surface.

In the present disclosure embodiments, a phosphate phosphor including an activation center of trivalent chromium and a light emitting device are provided. The light emitting device includes a light source and the above mentioned phosphate phosphor, such that the phosphate phosphor is excited by the light source and emits a wide spectrum of the infrared light. The light emitting device with wide emission spectrum of the infrared light may be widely applied in detecting devices.

A display device includes a display panel including a display surface, a light transmission mode converter configured to convert light transmission mode, a light reflective portion disposed on an opposite side of the light transmission mode converter from the display surface and configured to reflect light entered through the display surface toward the display surface, a light transmissive portion disposed on the opposite side of the light transmission mode converter from the display surface and configured to transmit light, and a color filter that is disposed closer to the display surface than the light reflective portion and the light transmissive portion are, and a light storing portion configured to store light to emit light having a complementary color of a color exhibited by the color filter, the light storing portion being disposed on an opposite side of the light transmissive portion from the display surface.

A color conversion film is provided. The film includes at least one narrow band emission phosphor dispersed within a binder matrix, wherein the narrow band emission phosphor has a D50 particle size from about 0.1 m to about 15 m and is selected from the group consisting of a green-emitting U.sup.6+-containing phosphor, a green-emitting Mn.sup.2+-containing phosphor, a red-emitting phosphor based on complex fluoride materials activated by Mn.sup.4+, and a mixture thereof. A device is also provided.

A color conversion film is provided. The film includes at least one narrow band emission phosphor dispersed within a binder matrix, wherein the narrow band emission phosphor has a D50 particle size from about 0.1 m to about 15 m and is selected from the group consisting of a green-emitting U.sup.6+-containing phosphor, a green-emitting Mn.sup.2+-containing phosphor, a red-emitting phosphor based on complex fluoride materials activated by Mn.sup.4+, and a mixture thereof. A device is also provided.