A light shield structure is disposed between an ultraviolet lamp and a filter screen of an air purifier, and comprises a first light shield element and a second light shield element. The first light shield element is disposed on an inner wall of the second light shield element. The second light shield element is provided with air inlets, and the first light shield element is staggered with the second light shield element, so that the air inlets are completely blocked by the first light shield element in a radial direction. An air inlet channel is formed between the first light shield element and the second light shield element. Under the precondition that the air inlet channel is formed by the first light shield element and the second light shield element, ultraviolet light can be completely shielded, so that the service life of the filter screen is prolonged.

A light shield structure is disposed between an ultraviolet lamp and a filter screen of an air purifier, and comprises a first light shield element and a second light shield element. The first light shield element is disposed on an inner wall of the second light shield element. The second light shield element is provided with air inlets, and the first light shield element is staggered with the second light shield element, so that the air inlets are completely blocked by the first light shield element in a radial direction. An air inlet channel is formed between the first light shield element and the second light shield element. Under the precondition that the air inlet channel is formed by the first light shield element and the second light shield element, ultraviolet light can be completely shielded, so that the service life of the filter screen is prolonged.

An excimer bulb assembly including an excimer bulb and a pass filter such that the excimer bulb assembly does not emit substantial UV radiation in wavelengths longer than 231 nm, 232 nm, 233 nm, 234 nm or 235 nm. The wavelengths are measured at an incident angle of zero (0) degrees to the filter plane. The pass filter is preferably constructed of a plurality of layers of hafnium oxide, and most preferably constructed of less than seventy five (75)layers of hafnium oxide. The excimer bulb, pass filter, and two electrical connectors may be adapted to form a cartridge which may be adapted to swivel along its main axis. The cartridge may further include a smart chip. The smart chip may retain and store information regarding the assembly and preferably retains hours of use of the excimer bulb.

A UV light medium can be enhanced to provide specific optical properties that assist in distributing UV light from a UV source to achieve a defined UV light pattern and effective UV disinfection. The properties of the UV light medium can be selected and enhanced by loading the medium with additives, applying a UV blocking pattern, varying the UV light medium material type, thickness, shape, layering, or surface texture. The medium can be any material subject to UV light during a UV treatment or disinfection process. The UV light medium can create a generally uniform UV light pattern that reduces UV hot spots. The UV light medium can diffuse UV light at a target area to enables more robust disinfection with the same or lower UV source intensity.

An air duct system includes an air duct having a main body. The main body of the air duct defines a passageway and an outer surface. The air duct system also includes one or more thermoelectric generators. Each thermoelectric generator includes a hot side and a cold side, and the hot side of the thermoelectric generator is positioned along the outer surface of the air duct.

An air duct system includes an air duct having a main body. The main body of the air duct defines a passageway and an outer surface. The air duct system also includes one or more thermoelectric generators. Each thermoelectric generator includes a hot side and a cold side, and the hot side of the thermoelectric generator is positioned along the outer surface of the air duct.

A short wavelength infrared (SWIR) energy emitting system or material for producing SWIR energy from an emission source emitting electromagnetic energy. The SWIR energy system or material comprises a phosphor material, an electromagnetic energy blocking member, a substrate for delivering the system or material to an electromagnetic energy emission source, and optionally, a securing member. The SWIR energy system or material may be in the form of a tape, sheet, or other laminar material capable of producing short wave infrared emission when excited at wavelengths shorter than that of the emission.

A short wavelength infrared (SWIR) energy emitting system or material for producing SWIR energy from an emission source emitting electromagnetic energy. The SWIR energy system or material comprises a phosphor material, an electromagnetic energy blocking member, a substrate for delivering the system or material to an electromagnetic energy emission source, and optionally, a securing member. The SWIR energy system or material may be in the form of a tape, sheet, or other laminar material capable of producing short wave infrared emission when excited at wavelengths shorter than that of the emission.

The invention provides an elongated luminescent body (100) comprising an elongated support (170) and a coating layer (180), wherein the elongated luminescent body (100) further comprises a body axis (BA), and a length parameter P of a body dimension perpendicular to the body axis (BA), wherein the length parameter P is selected from height (H), width (W) and diameter (D), wherein: —the elongated support (170) comprises a support material (171), a support material index of refraction n1, wherein the support material index of refraction n1 is at least 1.4, a support surface (172), and a support length (L1); —the coating layer (180) is configured on at least part of the support surface (172) over at least part of the support length (L1), wherein the coating layer (180) comprises a coating layer material (181), a coating layer index of refraction n2, wherein coating layer index of refraction n2 is at least 1.4, and a coating layer thickness (d1), wherein the coating layer material (181) has a composition different from the support material (171), wherein the coating layer material (181) comprises a luminescent material (120) configured to absorb one or more of UV radiation and visible light, and to convert into luminescent material light (8) having one or more wavelengths in one or more of the visible and the infrared; and —the support material (171) is transmissive for the luminescent material light (8), and (i) −0.2≤n1−n2≤0.2 and (ii) d1/P≤0.25 apply.

The invention provides an elongated luminescent body (100) comprising an elongated support (170) and a coating layer (180), wherein the elongated luminescent body (100) further comprises a body axis (BA), and a length parameter P of a body dimension perpendicular to the body axis (BA), wherein the length parameter P is selected from height (H), width (W) and diameter (D), wherein: —the elongated support (170) comprises a support material (171), a support material index of refraction n1, wherein the support material index of refraction n1 is at least 1.4, a support surface (172), and a support length (L1); —the coating layer (180) is configured on at least part of the support surface (172) over at least part of the support length (L1), wherein the coating layer (180) comprises a coating layer material (181), a coating layer index of refraction n2, wherein coating layer index of refraction n2 is at least 1.4, and a coating layer thickness (d1), wherein the coating layer material (181) has a composition different from the support material (171), wherein the coating layer material (181) comprises a luminescent material (120) configured to absorb one or more of UV radiation and visible light, and to convert into luminescent material light (8) having one or more wavelengths in one or more of the visible and the infrared; and —the support material (171) is transmissive for the luminescent material light (8), and (i) −0.2≤n1−n2≤0.2 and (ii) d1/P≤0.25 apply.