Transmissive White Phosphor Plates for use in LEP (blue laser pumped) Flashlight

Toys received in the mail: Transmissive White Phosphor Plates .

I confirmed them to be transmissive and to produce a very bright white appearing output. Great they used Sapphire for the wafer as it will conduct heat well when mounted to a heat sink. Maximum pump power from the laser is 7 watts per square mm.

These plates are very small, three sizes listed at the below link:

Phosphor targets

Transmissive White Phosphor Plate,Cct And Size Customizable - Buy Phosphor Plate,Transmissive,Customizable Product on Alibaba.com

Transmissive White Phosphor Plate,Cct And Size Customizable - Buy Phosphor Plate,Transmissive,Customizable Product on Alibaba.com

From smallest to largest:

  1. Three mm diameter sapphire wafer with 1 mm phosphor spot (measured .65 mm spot) 5700K $30.00

  2. Five mm diameter sapphire wafer with 1 mm spot (measured .65 mm spot) 6000K $30.00

  3. Eight mm diameter sapphire wafer with 3 mm spot (measured 3 mm spot) 7000K $30.00

Excitation Wavelength 440-460nm
Phosphor Dimensions (The yellow area) φ3mm/φ1mm
Total Dimensions φ80.7mm/φ50.65mm/φ3*0.65mm
Base Plate Material Sapphire
Color Temperature 5700K / 6000K / 7000K
Light Efficiency (Laser to White Light) 165lm/W@5500K
Max Working Temperature 200℃
Max Laser Power Density 7W/mm^2

lasertree

Thermal conductivity of Sapphire:

Nonmetals are often thought of as being relatively poor conductors of heat; however crystalline nonmetals can actually have very high thermal conductivities. The thermal conductivity of sapphire (aluminum oxide) actually exceeds that of very pure copper (RRR 500), from about 20K to 100K. Sapphire is used as an electrical insulator in heat sinking applications (magnet leads, for example) where excellent thermal conductivity and electrical isolation are required.

Note: 375 K is close to 100 C., 475 K is close to 200 C.

Supplier:
Shenzhen Guangchuangfeng Technology Co., Ltd.Contact Name: Sabrina Zhao

Registered company address: CN, Guangdong, Shenzhen, B1607, Rongde Times Square, Huaqiao New Village Community, Henggang Street, Longgang District Company Tel: 86-0755-13128736762
Company Email: sabrina@micost-optotech.com

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We need beams :slightly_smiling_face:

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I’m thinking this is small enough, I can just put it inside the lens adjustment ring on a 12 mm DTR module and shoot the blue laser beam through one that way, and then put a large collimation lens in front of that to focus the white beam output, will give that a try.

Edit: I need to find a way to heat sink the wafer, so that won’t work, but I can use parts of modules to do so.

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They look really cool. I’ll be looking forward to seeing a test using a NUBM44. :stuck_out_tongue:

When I ordered them I didn’t understand, I thought the 3 mm, 5 mm and 8 mm diameters called out on their web page was the size of the phosphor spots, nope, the diameter of the whole thing. I would not have ordered the 3 mm wafer if I knew it was that small of a diameter.

Considering most 445/450’s have a spot size of around 5x2mm it is a tad small. However a 1W diode could be focused slightly onto the surface without exceeding the damage threshold. And then you could have a small LEP with a slightly higher divergence.

I received two kinds of phosphor LED powder in the mail today, also received some surplus sapphire window disks in the mail too. I want to experiment with some of this powder sandwiched between two of the 25 mm disks pumped with blue.

The phosphor on the left is much finer grained material than the bag on the right, 500 nanometer and 10 micron particle sizes. The finer stuff coated the bag yellow.


ebay seller: sakg87. He’s a doctorial chemist, made this for me upon request. He sold it cheap as it took several steps at high temperature to make.

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Looks like there is a theme of extreme pumping with blue. :stuck_out_tongue:
Pretty cool.

Just stuff I’ve been learning about lately.

Phosphor is good stuff. And that is not a bad price for a good quantity.