news digest ♦ LEDs
significantly thinner converter layers. The thinner layers better dissipate the heat, thus enabling the higher temperatures in the LED,” says Ivar Tangring, SSL Product Development at Osram Opto Semiconductors, explaining the advantages of the innovative technology.
With that, the Oslon Square can reach a lifetime of considerably more than 50,000 hours even at high temperatures of up to 135° C in the LED.
Customers benefit from the properties of the new Oslon Square Measuring and binning at operating temperatures of 85° C is of great significance to customers who further process the LEDs into luminaires. They receive precise information on parameters such as luminous flux or colour stability, which they need to optimally define the properties of their products.
Furthermore, the improved temperature behaviour leads to higher luminous efficacy in the application.
“This luminous efficacy, meaning the ratio of luminous flux to applied electrical power, helps our customers to significantly optimise the price/performance ratio of their luminaire solutions,” Tangring emphasises.
Thanks to the higher permitted junction temperatures, fewer large heat sinks are required, and this simplifies the design of lamps and luminaires, because they can be smaller and therefore less costly.
Application in interior lighting
The 3 mm x 3 mm Oslon Square is particularly suitable for the various applications in buildings. At 85° C, it has a colour temperature ranging between 2,400 and 5,000 Kelvin, and can generate teither warm- or cold-white light. The LED has a beam angle of 120° and the typical voltage at 700 mA varies between 2.9 V and 3.2 V. The device has a maximum current of 1.8 A and a thermal resistance Rth of 3 K/W. These were previously 1.5 A and 3.8 K/W respectively..
The colour rendering index is over 80 and the luminous flux at 700 mA is an impressive 202 lumens at 3,000K.
Product variations with a different colour temperature spectrum and higher colour rendering indices are to follow.
At present, the new LED is undergoing extensive quality testing: The certification process under the LM-80 long lifetime standard is underway. The results of the 3,000 hour test are expected at the end of the year, those of the 6,000 hour test in spring 2014.
The new Oslon Square: Better heat dissipation, stable colour uniformity and a longer lamp life even at high temperatures
TrendForce: Sapphire substrate market to escalate
LED lighting and Smartphone application demands have led to sapphire substrate manufacturers production expansions
Spurred by LED lighting and mobile device market demands, sapphire substrate manufacturers have been actively expanding their production capacity, according to TrendForce subsidiary LEDinside’s “Global Sapphire Substrate Market 2013” research report.
The top five sapphire ingot manufacturers for instance, have seen 2-inch equivalent sapphire substrate monthly production capacity grow by 75 percent to 7800Kmm compared to 2012.
LED industry development has been driven by LED lighting market’s high demands, especially for LED bulbs, LED tubes and MR16. To meet the above demands, major LED chip manufacturers still have expansion plans for 2013-2014, including Korean manufacturer Seoul Viosys, Taiwanese manufacturer Epistar, and Chinese manufacturers San’an Opto and HC Semitek.
Major chip manufacturers are also continually raising 4-inch wafer production capacity, which has led to 40 percent production share in 2013, and is expected to reach 43 percent in 2014.
Handheld device applications have the strongest demands among non-LED application market demands. Since Apple introduced sapphire substrate material into the iPhone5 and iPhone 5S camera lens, and into the 5S home buttons with the entry of fingerprint identification feature.
98
www.compoundsemiconductor.net January / February 2014
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122 |
Page 123 |
Page 124 |
Page 125 |
Page 126 |
Page 127 |
Page 128 |
Page 129 |
Page 130 |
Page 131 |
Page 132 |
Page 133 |
Page 134 |
Page 135 |
Page 136 |
Page 137 |
Page 138 |
Page 139 |
Page 140 |
Page 141 |
Page 142 |
Page 143 |
Page 144 |
Page 145 |
Page 146 |
Page 147 |
Page 148 |
Page 149 |
Page 150 |
Page 151 |
Page 152 |
Page 153 |
Page 154 |
Page 155 |
Page 156 |
Page 157 |
Page 158 |
Page 159 |
Page 160 |
Page 161 |
Page 162 |
Page 163 |
Page 164 |
Page 165 |
Page 166 |
Page 167 |
Page 168 |
Page 169