Nitridoalumosilicate Phosphor Tuning for LED Efficiency
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Solution Overview
Problem
There is a need for more efficient and effective inorganic luminescent materials for solid-state lighting that can absorb blue and UV light and convert it into visible light, particularly in the green-yellow spectrum, as existing materials have limitations in efficiency and spectral properties.
Innovation Solution
A new class of phosphor materials with the composition M1-x-y-zZzAaBbCcDdEeN6-nOn:ESx,REy, where M, Z, A, B, C, D, and E are specific elements, crystallizing in a unique structure, allowing for tuning of emission bands through cation substitutions and charge compensation, resulting in high efficiency and narrow emission bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional phosphor materials are used for LED applications, then basic luminescence function is achieved, but luminescence efficiency and spectral properties are limited
Solution Approach 1:
The patent applies parameter changes by systematically varying the composition parameters (x, y, z1, z2) in the phosphor formula M1-x-y-z1-z2Zz1AaBbCcDdEeN6-nOx:ESx,REy to optimize both luminescence efficiency and spectral properties. By changing the ratios of different cations and the amounts of dopants, the patent achieves high efficiency while maintaining spectral tuning flexibility.
Solution Approach 2:
The patent uses composite materials by combining multiple elements (M, Z, A, B, C, D, E) in a complex nitridoalumosilicate structure with rare earth dopants (ES and RE). This composite approach enables simultaneous achievement of high luminescence efficiency and adjustable spectral characteristics through the synergistic effects of different components.
2Use of energy by moving object
If phosphor materials with broad emission bands are used, then high luminescence efficiency is achieved, but spectral precision and color purity are reduced
Solution Approach 1:
The patent applies local quality by creating specific local environments around the rare earth dopant ions through controlled substitution of cations (M, Z, A, B, C, D, E) in the host lattice. This local structural optimization enables narrow emission bands while maintaining high luminescence efficiency, as the local crystal field around each dopant ion is precisely engineered.
Solution Approach 2:
The patent uses parameter changes to control the emission band width by adjusting the composition parameters (particularly the amounts of different cations and dopants). By optimizing these parameters, the patent achieves narrow emission bands with peak wavelengths and half-widths that can be precisely controlled while maintaining high luminescence efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The new phosphor materials efficiently convert blue and UV light into green-yellow light with a narrow emission band, offering improved luminescence properties and flexibility in spectral tuning, suitable for various lighting applications.
Implementation Method 1
a new phosphor materials with the composition M1-x-y-zZzAaBbCcDdEeN6-nOn:ESx,REy... efficiently convert blue and UV light into green-yellow light
Data Source
AI summary
The invention provides, amongst others for application in a lighting unit, a phosphor having the formula M 1-x-y-z Zz Aa Bb Cc Dd Ee N6-nOn :ESx,REy (I), with M = selected from the group consisting of divalent Ca, Sr, and Ba; Z = selected from the group consisting of monovalent Na, K, and Rb; B = selected from the group consisting of divalent Mg, Mn, Zn, and Cd; C = selected from the group consisting of trivalent B, Al and Ga; D = selected from the group consisting of tetravalent Si, Ge, Ti, and Hf; A = selected from the group consisting of monovalent Li, and Cu; E = selected for the group consisting of P, V, Nb, and Ta; ES = selected from the group consisting of divalent Eu, Sm and Yb; RE = selected from the group consisting of trivalent Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm; 0 ≤ x ≤ 0.2; 0 ≤ y ≤ 0.2; 0 < x+y ≤ 0.4; 0 ≤ z < 1; x + y + z < 1; 0 ≤ n ≤ 0.75; 0 ≤ a ≤ 2 (such as 0 ≤ b ≤ 0.5); 0 ≤ b ≤2;0 ≤ c ≤ 4;0 ≤ d ≤ 4; 0 ≤ e ≤ 4; a + b = 2; c + d + e = 4; and a + 2b + 3c +4d + e + y -z = 16 –n.