{"product_id":"the-bandgap-rainbow-plate-059-physics-poster","title":"The Bandgap Rainbow – Plate 059 Physics Poster","description":"\u003cp\u003ePlate 59 speaks for itself: \u003cem\u003e“Colour is a gap.”\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eAn LED emits photons with energy close to its semiconductor's band gap, so the gap sets the colour. GaN emits near-UV, GaP green, GaAs infrared.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eλ [nm] = 1239.84 \/ E_g [eV]\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eλ: emission wavelength, nm\u003c\/li\u003e\n\u003cli\u003eE_g: band gap energy, eV (1 eV = 1.602176634×10⁻¹⁹ J)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAn electron crossing the gap emits E_g. GaP: indirect gap, so it emits weakly.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e Emission sits near, not exactly at, the gap; doping and temperature shift it.\u003c\/p\u003e\u003ch3\u003eSources\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eS. M. Sze, K. K. Ng, Physics of Semiconductor Devices, 3rd ed., Appendix.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eOn the poster\u003c\/h3\u003e\u003cp\u003ePlate 059, “The Bandgap Rainbow”: the pixel-art plate with its slogan “Colour is a gap.”, the key equation and the facts panel shown above. Pixelated Physics. Physics. Personified.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"9'' x 12\" (Vertical) \/ Matte","offer_id":50962550095975,"sku":"27434434997540207065","price":19.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Fine Art","offer_id":50962550128743,"sku":"11161539943310816983","price":29.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Semi Glossy","offer_id":50962550161511,"sku":"67778031815759182095","price":19.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Fine Art","offer_id":50962550194279,"sku":"27397217244631341232","price":44.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Semi Glossy","offer_id":50962550227047,"sku":"20511649312695955771","price":29.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Matte","offer_id":50962550259815,"sku":"27171222808106376299","price":29.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Matte","offer_id":50962550292583,"sku":"17765179946555606590","price":69.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Fine Art","offer_id":50962550325351,"sku":"22812085921485928571","price":119.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Semi Glossy","offer_id":50962550358119,"sku":"32510073060129650587","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/5361295249515819112_2048.jpg?v=1793634934","url":"https:\/\/pixelatedphysics.com\/nl\/products\/the-bandgap-rainbow-plate-059-physics-poster","provider":"Pixelated Physics","version":"1.0","type":"link"}