GB/T 24982-2020Garnet aluminate series of rare earth phosphors for white LED (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 24982-2010 "Rare-Earth Yellow Phosphors for White LED Lamps". Compared with GB/T 24982-2010, In addition to editorial changes, the main technical changes are as follows.

---Modified the scope of application of the standard (see Chapter 1, Chapter 1 of the 2010 edition);

--- Added the term "chromaticity coordinates" (see 3.3);

--- Deleted the term "emission wavelength" (see 3.4 in the 2010 edition);

--- Deleted the term "emission main peak wavelength" (see 3.5 in the 2010 edition);

--- Added the term "emission peak wavelength" (see 3.5);

--- Deleted the term "thermal stability" (see 3.6 in the 2010 edition);

--- Added the term "high temperature and high humidity test" (see 3.7);

--- Added the term "PCT Test" (see 3.8);

--- Added the term "particle size distribution coefficient" (see 3.9);

---Added product classification (see 4.1);

--- Deleted the term brand.200500 (see 4.1 in the 2010 edition);

---Modified the technical indicators of the chemical composition of the product (see 4.1, 4.1 in the 2010 edition);

---Added the technical indicators of particle size distribution coefficient (see 4.2);

--- Deleted the excitation wavelength range (see 4.1 in the 2010 edition);

---Modified the chromaticity coordinate technical indicators, and listed the chromaticity coordinate range according to the product category (see 4.2, 4.1 in the 2010 edition);

---Modified the brightness technical indicators, and listed the brightness range according to the product category (see 4.2, 4.1 in the 2010 edition);

---Modified the emission peak wavelength technical indicators, and its range was changed from 520nm~580nm to 495nm~580nm, and in accordance with The product category lists the peak wavelength range (see 4.2, 4.1 in the 2010 edition);

---Modified the density technical indicators, the range was changed from 4.5±0.3 to 4.2~6.5, and the density range was listed according to the product category (See 4.2, 4.1 of the 2010 edition);

--- Deleted the thermal stability technical indicators (see 4.1 in the 2010 edition);

---Modified the appearance of the product (see 4.3, 4.2 of the 2010 edition);

---Deleted the grades in the standard and replaced the grades with specifications (see 6.2, 7.1.1, 7.3, 6.2, 7.1.1, 7.3 of the 2010 edition);

---Modified the center particle size test method (see 5.3, 5.3 of the 2010 edition);

---Added the particle size distribution coefficient test method (see 5.4);

---Added the technical indicators of brightness reduction and chromaticity coordinate shift in the high temperature and high humidity test (see Appendix A);

---Added the technical indicators of brightness reduction and chromaticity coordinate offset in the PCT test (see Appendix A);

---Modified the thermal quenching brightness reduction and chromaticity coordinate offset technical indicators, the brightness reduction was modified from less than 25% to less than 10%, and the color The deviation of the product coordinates x and y values is changed from less than 0.0200 to less than 0.0020, and the thermal quenching is adjusted to the reference by the main performance index Performance indicators (see Appendix A, 4.1 in 2010 edition);

---Added high temperature and high humidity test method (see Appendix B);

---Added PCT test method (see Appendix C).

1 Scope

This standard specifies the technical requirements, test methods, inspection rules, signs, and signs of garnet structure aluminate phosphors for white light LEDs. Packaging, transportation, storage and quality certificate.

This standard is applicable to the garnet structure aluminate rare earth fluorescence prepared by high temperature solid phase reaction, coprecipitation method or combustion method and other liquid phase methods.

The phosphor emits yellow light, yellow-green light or green light when excited by a light source with a wavelength of 415nm~470nm. Light forms white light, which is mainly used to prepare white LED light-emitting devices excited by blue LED chips.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 5838.1 Phosphors Part 1: Terminology

GB/T 8170 Numerical rounding rules and the expression and determination of limit values

GB/T 14634.5 Test method of rare earth trichromatic phosphors for lamps-Part 5: Determination of density

GB/T 20170.1-2006 Test methods for physical properties of rare earth metals and their compounds Determination of particle size distribution of rare earth compounds

GB/T 23595 (all parts) Test method for rare earth yellow phosphors for white LED lamps

3 Terms and definitions

The following terms and definitions defined in GB/T 5838.1 apply to this document.