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JP-2026075278-A - Wavelength conversion device, light source device, and projector

JP2026075278AJP 2026075278 AJP2026075278 AJP 2026075278AJP-2026075278-A

Abstract

[Problem] To provide a wavelength conversion device, a light source device, and a projector that have excellent heat dissipation and can emit light with an expanded color gamut. [Solution] The wavelength conversion device of the present invention comprises a substrate, a phosphor layer disposed on the substrate which converts first light in a first wavelength band that is incident on the substrate into second light in a second wavelength band different from the first wavelength band, a reflective layer disposed between the phosphor layer and the substrate which reflects the first light and the second light, and an auxiliary light-emitting layer disposed between the phosphor layer and the reflective layer which contains a plurality of quantum dots and converts the first light that has passed through the phosphor layer and a portion of the second light converted by the phosphor layer into third light in a third wavelength band that is different from the first wavelength band and overlaps with a portion of the second wavelength band, wherein the planar size of the auxiliary light-emitting layer is larger than the planar size of the phosphor layer, and when viewed from the normal direction of the substrate, the entire phosphor layer overlaps the auxiliary light-emitting layer. [Selection Diagram] Figure 3

Inventors

  • 鬼頭 聡

Assignees

  • セイコーエプソン株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (10)

  1. circuit board and A phosphor layer disposed on the substrate, which converts the incident first light in a first wavelength band into second light in a second wavelength band different from the first wavelength band, An auxiliary light-emitting layer disposed between the phosphor layer and the substrate, comprising a plurality of quantum dots, converts a portion of the first light transmitted through the phosphor layer and the second light converted by the phosphor layer into a third light in a third wavelength band that is different from the first wavelength band and overlaps with a portion of the second wavelength band, The system comprises a reflective layer disposed between the auxiliary light-emitting layer and the substrate, which reflects light incident from the auxiliary light-emitting layer, When viewed from the normal direction of the substrate, The planar size of the auxiliary light-emitting layer is larger than the planar size of the phosphor layer, and the entire phosphor layer overlaps with the auxiliary light-emitting layer. Wavelength conversion device.
  2. The aforementioned phosphor layer is a green phosphor. The auxiliary light-emitting layer emits red light as the third light. The wavelength conversion device according to claim 1.
  3. The auxiliary light-emitting layer is in the form of a film and is bonded to the reflective layer and the phosphor layer via an adhesive layer. The wavelength conversion device according to claim 1.
  4. The auxiliary light-emitting layer further comprises a binder in which the plurality of quantum dots are dispersed, The binder is composed of a light-transmitting inorganic material. The wavelength conversion device according to claim 1.
  5. The aforementioned phosphor layer includes a plurality of pores, The pore content is 3 vol% or less in volume ratio to the total volume of the phosphor layer. The wavelength conversion device according to claim 1.
  6. The thickness of the phosphor layer is 200 μm or less, and the concentration of the activator in the phosphor layer is 1 mol% or less. The wavelength conversion device according to claim 1.
  7. The third wavelength band of the third light is 600 to 700 nm. The wavelength conversion device according to claim 1.
  8. The incident position of the first light in the phosphor layer does not change over time. The wavelength conversion device according to claim 1.
  9. The light source that emits the first light, The device comprises a wavelength conversion device according to any one of claims 1 to 8, to which the first light emitted from the light source is incident, Light source device.
  10. The light source device according to claim 9, A light modulator that modulates light, including the second light and the third light emitted from the light source device, according to image information, The system comprises a projection optical device that projects light modulated by the aforementioned optical modulation device, projector.

Description

This invention relates to a wavelength conversion device, a light source device, and a projector. In recent years, a technology has emerged for light sources used in projectors that excites a phosphor layer with blue light emitted from the light source, and then synthesizes the yellow fluorescence generated in the phosphor layer with the blue light not used for excitation in the phosphor layer to produce white illumination light (see, for example, Patent Document 1 below). Japanese Patent Publication No. 2015-197620 This is a schematic diagram showing a projector according to the first embodiment.This is a schematic diagram showing the light source device 2 of the embodiment.This is a cross-sectional view showing the configuration of the wavelength conversion device 50.This graph shows the temperature characteristics of the conversion efficiency of the phosphor layer and the quantum dot layer.This graph shows the temperature conditions of the phosphor layer and the auxiliary light-emitting layer.This is a plan view of a wavelength conversion device.This graph shows the emission spectrum of fluorescence emitted by a wavelength conversion device.This figure shows the cross-sectional structure of a modified wavelength conversion device.This figure shows the cross-sectional structure of a modified wavelength conversion device. (First Embodiment) The following describes one embodiment of the present invention. Figure 1 is a schematic diagram showing a projector according to the first embodiment. As shown in Figure 1, the projector 1 of this embodiment is a projection-type image display device that displays an image on a screen SCR. The projector 1 comprises a light source device 2, a color separation optical system 3, an optical modulator 4R, an optical modulator 4G, an optical modulator 4B, a combining optical system 5, and a projection optical system 6. The light source device 2 emits white illumination light WL toward the color separation optical system 3. The configuration of the light source device 2 will be explained in detail later. The color separation optical system 3 separates the illumination light WL emitted from the light source device 2 into red light LR, green light LG, and blue light LB. The color separation optical system 3 includes a first dichroic mirror 7a, a second dichroic mirror 7b, a first total reflection mirror 8a, a second total reflection mirror 8b, a third total reflection mirror 8c, a first relay lens 9a, and a second relay lens 9b. The first dichroic mirror 7a separates the illumination light WL from the light source device 2 into red light LR and light containing green light LG and blue light LB. The first dichroic mirror 7a transmits the red light LR and reflects the light containing green light LG and blue light LB. On the other hand, the second dichroic mirror 7b reflects the green light LG and transmits the blue light LB. As a result, the second dichroic mirror 7b separates the light containing green light LG and blue light LB into green light LG and blue light LB. The first total reflection mirror 8a is positioned in the optical path of red light LR and reflects the red light LR that has passed through the first dichroic mirror 7a toward the optical modulator 4R. Meanwhile, the second total reflection mirror 8b and the third total reflection mirror 8c are positioned in the optical path of blue light LB and guide the blue light LB that has passed through the second dichroic mirror 7b toward the optical modulator 4B. Green light LG is reflected from the second dichroic mirror 7b toward the optical modulator 4G. The first relay lens 9a is positioned between the second dichroic mirror 7b and the second total internal reflection mirror 8b in the optical path of the blue light LB. The second relay lens 9b is positioned between the second total internal reflection mirror 8b and the third total internal reflection mirror 8c in the optical path of the blue light LB. The first and second relay lenses 9a and 9b compensate for the optical loss of the blue light LB caused by the blue light LB's optical path length being longer than that of the red light LR and green light LG. The optical modulator 4R modulates red light LR according to image information to form image light corresponding to red light LR. The optical modulator 4G modulates green light LG according to image information to form image light corresponding to green light LG. The optical modulator 4B modulates blue light LB according to image information to form image light corresponding to blue light LB. Each of the optical modulators 4R, 4G, and 4B uses, for example, a transmissive liquid crystal panel. Polarizing plates (not shown) are also positioned on the incident and exit sides of the liquid crystal panel. A field lens 10R is positioned on the incident side of the optical modulator 4R. The field lens 10R parallelizes the red light LR incident on the optical modulator 4R. A field lens 10G is positioned on the incident side