GB/T 23595.5-2009 English PDF

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GB/T 23595.5-2009: Test methods of rare earth yellow phosphor for white LED lamps -- Part 5: Determination of pH value
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 23595.5-2009	189	Add to Cart	3 days	Test methods of rare earth yellow phosphor for white LED lamps -- Part 5: Determination of pH value	Valid

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Basic data

Standard ID: GB/T 23595.5-2009 (GB/T23595.5-2009)
Description (Translated English): Test methods of rare earth yellow phosphor for white LED lamps -- Part 5: Determination of pH value
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H14
Classification of International Standard: 77.120.99
Word Count Estimation: 8,883
Date of Issue: 2009-04-23
Date of Implementation: 2010-02-01
Regulation (derived from): National Standard Approval Announcement 2009 No.5 (Total No.145)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the 440nm ~ 480nm blue LED lights to stimulate white yellow Determination of rare earth phosphors pH. This section applies to 440nm ~ 480nm blue light excitation with rare yellow phosphor Determination of pH of white LED lights. Measuring range: pH0 ~ pH14.

GB/T 23595.5-2009: Test methods of rare earth yellow phosphor for white LED lamps -- Part 5: Determination of pH value

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Test methods of rare earth yellow phosphor for white LED lamps Part 5. Determination of pH value ICS 77.120.99 H14 National Standards of People's Republic of China Test methods of rare earth yellow phosphor white LED lamp Posted 2009-04-23 2010-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 23595-2009 "white LED light rare earth yellow phosphor Test Method" is divided into six parts. --- Part 1. Determination of the spectral properties; --- Part 2. Determination of relative brightness; --- Part 3. Determination of chromaticity coordinates; --- Part 4. Determination of thermal stability; --- Part 5. Determination of pH; --- Part 6. Determination of electrical conductivity. This is Part 5. This part of the National Standardization Technical Committee rare and centralized. This section is Xiamen Topstar New Materials Co., Ltd. is responsible for drafting. This section from Hangzhou Daming Fluorescent Material Co., Ltd. Changshu City, the Asia-Pacific fluorescent material, Jiangmen City Branch Hang Industrial Company Limited Division participated in the drafting. The main drafters of this section. Lan Wei, Han Jun Xiang, Daisy Ling, Wang Chunjian. The drafters of some of the participants. He Haiyan, Gu Guohua, Huang Rui sweet. Test methods of rare earth yellow phosphor white LED lamp

1 Scope

This section provides 440nm ~ 480nm blue light excitation white LED measurement method using rare earth yellow phosphor pH. This section applies to 440nm ~ 480nm blue light excitation rare earth yellow phosphor Determination of pH white LED lights. Determination Fan Wai. pH0 ~ pH14.

2 principle of the method

Under certain ambient temperature, a certain quality white LED light rare earth yellow phosphor (hereinafter referred to as gluten) in a volume of water Displayed pH value represents yellow powder pH.

3 test instruments and solvent

3.1 pH meter. with temperature compensation function, range 0 to 14, and the accuracy of ± 0.1. 3.2 Standard solution. pH values \u200b\u200bwere 4.00,6.86,9.18. 3.3 potassium chloride solution (0.1mol/L). Weigh 3.728g potassium chloride (AR grade) in 100mL beaker, adding an appropriate amount of deionized water and dissolved After the solution transferred to 500mL volumetric flask, and diluted with water to volume, and mix. 3.4 magnetic stirrer. power ≤90W, adjustable speed timing. 3.5 Magnetic sub. about 25mm. 3.6 plastic beaker. 50mL. 3.7 Analytical Balance. Precision 0.001g. 3.8 Pipette. 20mL. 3.9 Deionized water. Conductivity ≤2μS/cm.

4 Test Procedure

4.1 Production Solution 4.1.1 Using an analytical balance (3.7) weigh the sample into 2g 50mL plastic beakers (3.6), and with a pipette (3.8) was added 20mL of deionized water (3.9), into a 25mm long magnetic sub (3.5), cover the slides. 4.1.2 The beaker containing the sample and water on a magnetic stirrer (3.4), the mixture was stirred after 20min standing stratification. 4.1.3 medium speed filter paper filtered upper clear liquid, and add about 0.05mL potassium chloride solution (3.3) in the supernatant liquid, with a glass rod to be Measuring liquid, stir. 4.2 Test 4.2.1 Adjust the "Temperature Compensation" knob to the temperature at this time of the test solution, and then switch to the "pH" place. 4.2.2 The electrode into standard solution pH = 6.86 (3.2), shake the bottle to be balanced, adjust the "positioning" knob until the instrument displays the phase The corresponding values. 4.2.3 Place the electrode in pH = 4.00 or pH = 9.18 of the standard solution (3.2), shake the bottle, to be balanced, adjust the "slope" knob Until the instrument displays the corresponding pH. Repeating the above steps at least three times, until the respective two pH values \u200b\u200bstable. After calibration is complete, "Positioning", "Slope" knob may not move again. 4.2.4 Place the electrode in the test solution, shake the bottle, to be balanced, the pH of the solution can be read from the instrument display. ......

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