GB/T 24980-2020Rare earth long afterglow phosphors (English PDF)

Foreword

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

This standard replaces GB/T 24980-2010 "Rare Earth Long Afterglow Phosphors", compared with GB/T 24980-2010, except for editorial changes The main technical changes are as follows.

---Modified the application fields of rare earth long afterglow phosphors in the scope (see Chapter 1, Chapter 1 of the 2010 edition);

--- The term "standard phosphor" is deleted, and the subsequent serial numbers are adjusted sequentially (see 3.2 in the 2010 edition);

---Modified the definition of "luminous color" (see 3.2, 3.3 in 2010 edition);

---Modified the term "relative brightness" to "afterglow brightness" (see 3.3, 3.4 in 2010 edition);

--- Deleted the term "particle size distribution" (see 3.5 in the 2010 edition);

---Modified "product classification and brand" to "product classification and reference composition" and the corresponding content, deleted the conventional alkaline earth aluminate Level three (see 4.1, 4.1 in 2010 edition);

---Added the division and expression of product brands (see 4.2);

---Modified product technical indicators and expression methods, the center particle size range of each brand, the chromaticity coordinate x, y value and emission of each brand The main peak value, respectively, put forward the requirements of alkaline earth aluminate, silicate and sulfur oxide (see 5.1.1, 5.1.2, 5.1.3, 4.1 in 2010 edition);

--- Modified the sieving particle size distribution and sieving particle size range of alkaline earth aluminate granular products (see 5.1.1, Appendix A, 2010 edition 5.3);

---Modified the requirements of appearance quality and added different luminous colors (yellow-green, blue-green, blue, orange-red) long afterglow powder appearance Description of the color (see 5.2, 4.2 of the 2010 edition);

---Modified the "test method" (see Chapter 6, Chapter 4 of the 2010 edition);

---The determination of particle size distribution has been deleted, and a normative appendix A has been added (see 5.3 of the 2010 edition);

---Modified the acceptance questioning time, adjusted from 3 months to 1 month (see 7.1.2, 2010 version 6.1.2).

1 Scope

This standard specifies the technical requirements, test methods, inspection rules, signs, packaging, transportation, storage and quality certification of rare earth long afterglow phosphors Ming book.

This standard is applicable to the rare earth long afterglow fluorescence of aluminate system, silicate system and sulfur oxide system prepared by high temperature solid phase reaction Powder, mainly used for emergency signs and escape signs in the field of fire protection, low-light indications in the plastic, ink, and ceramic industries, and dark vision rings such as outdoors and roads. Indications and low-light lighting under circumstances.

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 8170 Numerical rounding rules and the expression and determination of limit values

GB/T 15676 Rare earth terms

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 24981 (all parts) Test method for rare earth long afterglow phosphors

3 Terms and definitions

The following terms and definitions defined in GB/T 15676 apply to this document.

4 Categories

4.1 Product system, category, reference component and excitation light source and afterglow brightness test light source illuminance

4.1.1 The products are divided into three systems of alkaline earth aluminate, silicate, and sulfur oxide according to their chemical composition.

Luminance test light source illuminance is divided into three categories. conventional type, granular type, and low-light type. For each product system and code, category and reference components, see Table 1. […]