A phosphor wheel (13) includes: a first surface having a disk shape; a second surface opposite the first surface; a phosphor layer (13b) having an annular shape and being provided on the first surface; a plurality of openings (13c); and a plurality of first blade parts (33a). The plurality of openings (13c) are disposed radially inward of the annular-shaped phosphor layer (13b) and arrayed along a circumferential direction. The plurality of first blade parts (33a) are located respectively adjacent to the plurality of openings (13c) in the first surface and configured to blow air to a surface of the phosphor layer (13b).

A lighting device comprises a holder for LED filaments. The holder has a first electrically conductive holding structure and a second electrically conductive holding structure. Each holding structure comprises an essentially longitudinal connection section and an attachment section essentially perpendicular to the connection section.

A lighting device comprises a holder for LED filaments. The holder has a first electrically conductive holding structure and a second electrically conductive holding structure. Each holding structure comprises an essentially longitudinal connection section and an attachment section essentially perpendicular to the connection section.

Aspects of the present disclosure provide an LED lamp assembly, comprising a glass envelope, an LED platform comprising a printed circuit board supported by a stem assembly disposed within the envelope, a base hermetically sealed to the envelope, and a gas disposed within the envelope. The gas is capable of providing both thermal conductivity between the LED platform and the envelope, while also mitigating volatile organic compounds present within the envelope.

Aspects of the present disclosure provide an LED lamp assembly, comprising a glass envelope, an LED platform comprising a printed circuit board supported by a stem assembly disposed within the envelope, a base hermetically sealed to the envelope, and a gas disposed within the envelope. The gas is capable of providing both thermal conductivity between the LED platform and the envelope, while also mitigating volatile organic compounds present within the envelope.

Disclosed are a wavelength conversion device and a light emitting device. The wavelength conversion device includes a wavelength conversion layer used for absorbing excitation light and generating converted light; a box having a first area used for transmitting the excitation light to the wavelength conversion layer and a second area used for transmitting the converted light, and further including an air outlet and an air inlet; a conduit, disposed outside the box and used for connecting the air inlet and the air outlet, so as to seal with the box the wavelength conversion layer in the box; a heat exchanger, used for decreasing a gas temperature in the conduit; and a gas circulation device, disposed in sealed space encircled by the box and the conduit, and used for driving exchange between gas in the box and gas in the conduit. The wavelength conversion device achieves both dust prevention and heat dissipation.

Disclosed are a wavelength conversion device and a light emitting device. The wavelength conversion device includes a wavelength conversion layer used for absorbing excitation light and generating converted light; a box having a first area used for transmitting the excitation light to the wavelength conversion layer and a second area used for transmitting the converted light, and further including an air outlet and an air inlet; a conduit, disposed outside the box and used for connecting the air inlet and the air outlet, so as to seal with the box the wavelength conversion layer in the box; a heat exchanger, used for decreasing a gas temperature in the conduit; and a gas circulation device, disposed in sealed space encircled by the box and the conduit, and used for driving exchange between gas in the box and gas in the conduit. The wavelength conversion device achieves both dust prevention and heat dissipation.

A lighting device comprises a holder for LED filaments. The holder has a first electrically conductive holding structure and a second electrically conductive holding structure. Each holding structure comprises an essentially longitudinal connection section and an attachment section essentially perpendicular to the connection section.

A lighting device comprises a holder for LED filaments. The holder has a first electrically conductive holding structure and a second electrically conductive holding structure. Each holding structure comprises an essentially longitudinal connection section and an attachment section essentially perpendicular to the connection section.

A laser projection display device, relating to the technical field of laser, including a laser light source having a light source shell, an airtight device fixed on an inner wall of the light source shell, and a laser device provided in the interior of the airtight device. The airtight device having a sealing housing and a gas pressure adjustment structure, the sealing housing is fixed on an inner wall of the light source shell, the gas pressure adjustment structure is arranged on one side of the sealing housing, the sealing housing is communicated with the gas pressure adjustment structure, and the gas pressure adjustment structure is configured to adjust the volume of the airtight device.